GB/T 1299-2000 Alloy Tool Steels – Chinese National Standard

2026-05-30
ਗ੍ਰਾਮ
40

GB/T 1299-2000 — Alloy Tool Steels

ICS 77.140.20

H 40

People’s Republic of China National Standard

GB/T 1299–2000

Alloy Tool Steels

Published: 2000-10-25 | Implemented: 2001-09-01

Issued by: State Bureau of Quality and Technical Supervision

Foreword

This standard is adopted non-equivalently from ASTM A681-1994 “Alloy Tool Steels” (USA).

Compared with ASTM A681:

  • For the 14 grades specified in this standard, their chemical compositions and heat treatment regimes for test specimens are basically the same as those in ASTM A681.
  • The requirements for residual elements in this standard are stricter than those in the US standard.
  • This standard has stricter requirements than the US standard regarding pearlite structure, network carbide, and eutectic carbide non-uniformity.

    • Compared with the previous standard:

  • Four new grades have been added: 6CrMnSi2Mo1V, 5Cr3Mn1SiMo1V, 3Cr2MnNiMo, and 7CrSiMnMoV.
  • This standard adds provisions for testing acid-etched macrostructure and cancels the fracture surface inspection of steel.
  • This standard adds provisions for delivery in pre-hardened condition.
  • This standard adds requirements for residual elements.

    • This standard replaces GB/T 1299–1985 “Technical Conditions for Alloy Tool Steels” from the date of implementation.

    Appendix A of this standard is a normative appendix.

    Appendix B of this standard is an informative appendix.

    This standard was proposed by the State Metallurgical Industry Bureau.

    This standard is under the jurisdiction of the National Steel Standardization Technical Committee.

    This standard was drafted by Shougang Special Steel Company and the Central Research Institute of Metallurgical Information and Standards.

    Main drafters: Han Chunyu, Luan Yan, Zhang Weitang, Zhang Tiegang, Liu Baoshi, Dai Qiang.

    This standard was first published in December 1977 and first revised in July 1985.

    1 Scope

    This standard specifies the classification, dimensions, shape and permissible deviations, technical requirements, test methods, inspection rules, packaging, marking, and quality certificates for alloy tool steels.

    This standard applies to hot-rolled, forged, cold-drawn, and bright alloy tool steels. Their chemical compositions also apply to ingots, blooms, and their finished products.

    2 Normative References

    The following documents contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, all editions indicated are valid. All standards are subject to revision, and parties using this standard should investigate the possibility of applying the latest editions of the following documents.

    Reference Title
    GB/T 222–1984 Sampling and allowable deviation of finished chemical composition for steel chemical analysis
    GB/T 223 series Chemical analysis methods for iron, steel and alloy (various parts for different elements: P, Mn, Si, Al, Cr, V, Cu, Co, Ni, Mo, Nb, Ti, etc.)
    GB/T 224–1987 Method for determination of decarburization depth of steel
    GB/T 226–1991 Method for acid etch testing on macrostructure and defects of steel
    GB/T 230–1991 Metallic materials — Rockwell hardness test
    GB/T 231.1–2000 Metallic materials — Brinell hardness test — Part 1: Test method
    GB/T 908–1987 Steel forged round bars and square bars — Dimensions, shape, tolerances
    GB/T 911–1966 Dimensions, shape, and tolerances of steel hot-rolled square bars
    GB/T 2101–1989 General rules of inspection, packaging, marking, and certification for steel

    3 Classification

    Alloy tool steels are classified by application as follows:

  • Carbon and low alloy cold work tool steels (Groups 1 and 2)
  • Cold work die steels (Group 3)
  • Hot work die steels (Groups 4 and 5)
  • Plastic mold steels (Group 6)

    • 4 Dimensions, Shape, and Permissible Deviations

    4.1 The dimensions and shape of hot-rolled round bars shall be as agreed upon in the contract. If not specified, the supplier shall determine them.

    4.2 The dimensions, shape and permissible deviations of hot-rolled square bars shall be as agreed upon in the contract. If not specified, the supplier shall determine them.

    4.3 The dimensions, shape and permissible deviations of hot-rolled hexagonal bars shall be as agreed upon in the contract. If not specified, the supplier shall determine them.

    4.4 The dimensions, shape and permissible deviations of hot-rolled flat bars shall be as agreed upon in the contract. If not specified, the supplier shall determine them.

    4.5 The dimensions, shape and permissible deviations of forged flat bars shall comply with GB/T 16761. The group shall be specified in the contract; if not specified, the supplier shall determine.

    4.6 The dimensions, shape and permissible deviations of other steel products (blooms) shall comply with the relevant national and industry standards. Items not covered by national or industry standards shall be agreed upon between the supplier and the purchaser.

    5 Technical Requirements

    5.1 Grades and Chemical Composition

    5.1.1 The grades and chemical compositions (ladle analysis) of the steels shall comply with the provisions of Table 1.

    5.1.1 Table 1 — Chemical Composition

    Group 1: Carbon and Low Alloy Tool Steels

    No. ਗਰੇਡ Unified No. ਸੀ Si Mn Cr W Mo V Others (max) P (max) S (max)
    1-1 9SiCr T30100 0.85–0.95 1.20–1.60 0.30–0.60 0.95–1.25 – – – – 0.030 0.030
    1-2 8MnSi T30060 0.75–0.85 0.80–1.05 0.80–1.10 – – – – – 0.030 0.030
    1-3 Cr06 T30001 1.05–1.20 ≤0.40 ≤0.40 0.50–0.70 – – – – 0.030 0.030
    1-4 Cr2 T30201 1.00–1.10 ≤0.40 ≤0.40 1.30–1.50 – – – – 0.030 0.030
    1-5 9Cr2 T30200 0.85–0.95 ≤0.40 ≤0.40 1.30–1.65 – – – – 0.030 0.030
    1-6 W T30203 1.20–1.30 ≤0.40 ≤0.40 – 0.80–1.10 – – – 0.030 0.030

    Group 2: Impact Tool Steels

    No. ਗਰੇਡ Unified No. ਸੀ Si Mn Cr W Mo V Others (max) P (max) S (max)
    2-1 4CrW2Si T40124 0.35–0.45 1.20–1.60 ≤0.50 1.00–1.30 2.00–2.50 – – – 0.030 0.030
    2-2 5CrW2Si T40125 0.45–0.55 1.20–1.60 ≤0.60 1.00–1.30 2.00–2.50 – – – 0.030 0.030
    2-3 6CrW2Si T40126 0.55–0.65 1.20–1.60 ≤0.50 0.90–1.20 2.00–2.70 – – – 0.030 0.030
    2-4 6CrMnSi2Mo1V T40100 0.50–0.60 1.50–1.80 0.80–1.10 0.80–1.10 – 0.20–0.40 0.15–0.35 – 0.030 0.030
    2-5 5Cr3Mn1SiMo1V T40300 0.45–0.55 0.80–1.15 0.80–1.20 2.00–2.50 – 0.80–1.20 0.80–1.20 – 0.030 0.030

    Group 3: Cold Work Die Steels

    No. ਗਰੇਡ Unified No. ਸੀ Si Mn Cr W Mo V Others (max) P (max) S (max)
    3-1 Cr12 T21200 2.00–2.30 ≤0.40 ≤0.40 11.50–13.00 – – – – 0.030 0.030
    3-2 Cr12Mo1V1 T21202 1.40–1.60 ≤0.60 ≤0.60 11.00–13.00 – 0.80–1.20 0.70–1.10 – 0.030 0.030
    3-3 Cr12MoV T21201 1.45–1.70 ≤0.40 ≤0.40 11.00–12.50 – 0.40–0.60 0.15–0.30 Co: ≤1.00 0.030 0.030
    3-4 Cr5Mo1V T20503 0.95–1.05 ≤0.50 ≤1.00 4.75–5.50 – 0.90–1.40 0.15–0.50 – 0.030 0.030
    3-5 9Mn2V T20000 0.85–0.95 ≤0.40 1.70–2.00 ≤0.25 – – 0.10–0.25 – 0.030 0.030
    3-6 CrWMn T20111 0.90–1.05 ≤0.40 0.80–1.10 0.90–1.20 1.20–1.60 – – – 0.030 0.030
    3-7 9CrWMn T20110 0.85–0.95 ≤0.40 0.90–1.20 0.50–0.80 0.50–0.80 – – – 0.030 0.030
    3-8 Cr4W2MoV T20421 1.12–1.25 0.40–0.70 ≤0.40 3.50–4.00 1.90–2.60 0.80–1.20 0.80–1.10 Nb: 0.20– 0.030 0.030
    3-9 6Cr4W3Mo2VNb T20432 0.60–0.70 ≤0.40 ≤0.40 3.80–4.40 2.50–3.50 1.80–2.50 0.80–1.20 Nb: 0.35–0.55 0.030 0.030
    3-10 6W6Mo5Cr4V T20465 0.55–0.65 ≤0.40 ≤0.60 3.70–4.30 6.00–7.00 4.50–5.50 0.70–1.10 – 0.030 0.030
    3-11 7CrSiMnMoV T20104 0.65–0.75 0.85–1.15 0.65–1.05 0.90–1.20 – 0.20–0.50 0.15–0.30 – 0.030 0.030

    Group 4: Hot Work Die Steels

    No. ਗਰੇਡ Unified No. ਸੀ Si Mn Cr W Mo V Al Others (max) P (max) S (max)
    4-1 5CrMnMo T20102 0.50–0.60 0.25–0.60 1.20–1.60 0.60–0.90 – 0.15–0.30 – – – 0.030 0.030
    4-2 5CrNiMo T20103 0.50–0.60 ≤0.40 0.50–0.80 0.50–0.80 – 0.15–0.30 – – – 0.030 0.030
    4-3 3Cr2W8V T20280 0.30–0.40 ≤0.40 ≤0.40 2.20–2.70 7.50–9.00 – 0.20–0.50 – – 0.030 0.030
    4-4 5Cr4Mo3SiMnVAl T20403 0.47–0.57 0.80–1.10 0.80–1.10 3.80–4.30 2.80–3.40 0.80–1.20 0.80–1.10 – Ni: – 0.030 0.030
    4-5 3Cr3Mo3W2V T20323 0.32–0.42 0.60–0.90 ≤0.65 2.80–3.30 1.20–1.80 2.50–3.00 0.80–1.20 – Ni: 1.40 0.030 0.030
    4-6 5Cr4W5Mo2V T20452 0.40–0.50 ≤0.40 ≤0.40 3.40–4.40 4.50–5.30 1.50–2.10 0.70–1.10 – – 0.030 0.030
    4-7 8Cr3 T20300 0.75–0.85 ≤0.40 ≤0.40 3.20–3.80 – – – – – 0.030 0.030
    4-8 4CrMnSiMoV T20101 0.35–0.45 0.80–1.10 0.80–1.10 1.30–1.50 – 0.40–0.60 0.20–0.40 – – 0.030 0.030
    4-9 4Cr3Mo3SiV T20303 0.35–0.45 0.80–1.20 0.25–0.70 3.00–3.75 – 2.00–3.00 0.25–0.75 – – 0.030 0.030
    4-10 4Cr5MoSiV T20501 0.33–0.43 0.80–1.20 0.20–0.50 4.75–5.50 – 1.10–1.60 0.30–0.60 – Ni: 1.00 0.030 0.030
    4-11 4Cr5MoSiV1 T20502 0.32–0.45 0.80–1.20 0.20–0.50 4.75–5.50 – 1.10–1.75 0.80–1.20 – Ni: 1.40 0.030 0.030
    4-12 4Cr5W2VSi T20520 0.32–0.42 0.80–1.20 ≤0.40 4.50–5.50 1.60–2.40 – 0.60–1.00 – – 0.030 0.030

    Group 5: Non-magnetic Die Steels

    No. ਗਰੇਡ Unified No. ਸੀ Si Mn Cr W Mo V Al Others (max) P (max) S (max)
    5-1 7Mn15Cr2Al3V2WMo T23152 0.65–0.75 ≤0.80 14.50–16.50 2.00–2.50 0.50–0.80 0.50–0.80 1.50–2.00 2.30–3.30 – 0.030 0.030

    Group 6: Plastic Mold Steels

    No. ਗਰੇਡ Unified No. ਸੀ Si Mn Cr W Mo V Others (max) P (max) S (max)
    6-1 3Cr2Mo T22020 0.28–0.40 0.20–0.40 0.60–1.00 1.40–2.00 – 0.30–0.55 – Ni: 0.85 0.030 0.030
    6-2 3Cr2MnNiMo T22024 0.32–0.40 0.20–0.40 1.10–1.50 1.70–2.00 – 0.25–0.40 – Ni: 0.85–1.15 0.030 0.030

    5.1.2 For 5CrNiMo steel, with agreement between supplier and purchaser, vanadium content less than 0.20% is permitted.

    5.1.3 The residual copper content in the steel shall not exceed 0.30%, and the sum of “copper + nickel” shall not exceed 0.55%.

    5.1.4 The permissible deviations of chemical composition for steel or blooms shall comply with the provisions of Table 2 of GB/T 222–1984.

    5.2 Delivery Condition

    Steels are delivered in the annealed condition. Upon purchaser’s request, grades 7Mn15Cr2Al3V2WMo, 3Cr2Mo and 3Cr2MnNiMo may be delivered in the pre-hardened condition.

    5.3 Macrostructure

    Steels shall be tested for acid-etched macrostructure. The acid-etched macro-test pieces shall not show visually apparent pipe, inclusions, laminations, cracks, blowholes, or white spots. Central porosity and ingot-type segregation shall be assessed according to the Level 3 chart of this standard, and shall comply with the provisions of Table 2.

    Table 2 — Macrostructure Acceptance Criteria (levels, not exceeding)

    Section Size (mm) **Group 1** **Group 2**
    Central Porosity Ingot-Type Segregation Central Porosity Ingot-Type Segregation
    ≤50 4.0 6.0 3.0 6.0
    >50–75 4.5 6.0 3.5 6.0
    >75–100 4.5 6.0 4.5 6.0
    >100–125 5.0 6.0 4.5 6.0
    >125–155 5.0 6.0 5.0 6.0
    >155 To be agreed between supplier and purchaser

    Note 1: Group 1 includes: Grades 1-1 through 1-6; 2-1 through 2-3; 3-4 through 3-8; 3-11; 4-1 through 4-2; 4-7 through 4-12; 6-1 through 6-2.

    Note 2: All remaining grades belong to Group 2.

    5.4 Hardness

    5.4.1 The hardness in the delivered condition and the hardened hardness of test specimens shall comply with the provisions of Table 3. If the supplier can guarantee that the hardened hardness of test specimens meets the requirements of Table 3, testing may be waived.

    5.4.2 Upon purchaser’s request and by mutual agreement, annealed 9SiCr steel for the manufacture of threading tools shall have a Brinell hardness of 187–229 HBW 10/3000.

    5.4.3 Hot work die steels are not subject to hardened hardness testing of test specimens.

    Table 3 — Hardness Requirements

    No. Group ਗਰੇਡ Brinell Hardness HBW 10/3000 (Delivered) Austenitizing Temp. Cooling Medium Hardness HRC (not less than)
    1-1 9SiCr 241–197 860–880 °C Oil 62
    1-2 8MnSi ≤229 780–800 °C Oil 60
    1-3 Cr06 ≤179 780–810 °C Water 64
    1-4 Cr2 ≤179 800–830 °C Oil 62
    1-5 9Cr2 ≤179 800–830 °C Oil 62
    1-6 W ≤187 810–830 °C Oil 62
    2-1 4CrW2Si ≤229 860–900 °C Oil 53
    2-2 5CrW2Si ≤229 860–900 °C Oil 55
    2-3 6CrW2Si 285–229 860–900 °C Oil 57
    2-4 6CrMnSi2Mo1V ≤269 860–890 °C Oil 58
    2-5 5Cr3Mn1SiMo1V ≤255 870–900 °C Oil 56
    3-1 Cold work die Cr12 269–217 950–980 °C Oil 60
    3-2 Cr12Mo1V1 255–207 950–1000 °C, hold 10–20 min, air cool, 200 °C Oil 59
    3-3 Cr12MoV 269–217 950–980 °C Oil 58
    3-4 Cr5Mo1V ≤269 950 °C (salt bath) or 960 °C (controlled atmosphere), hold 5–15 min, air cool, 200 ± 6 °C Oil 60
    3-5 9Mn2V ≤229 780–810 °C Oil 62
    3-6 CrWMn 255–207 800–830 °C Oil 62
    3-7 9CrWMn 241–197 800–830 °C Oil 62
    3-8 Cr4W2MoV ≤269 960–980 °C, 1020–1040 °C Oil 60
    3-9 6Cr4W3Mo2VNb ≤255 1100–1160 °C Oil 60
    3-10 6W6Mo5Cr4V ≤269 1180–1200 °C Oil 60
    3-11 7CrSiMnMoV ≤235 870–900 °C Air cool 60
    4-1 Hot work die 5CrMnMo ≤229 820–850 °C Oil 42
    4-2 5CrNiMo ≤229 830–860 °C Oil 44
    4-3 3Cr2W8V ≤255 1075–1125 °C Oil 44
    4-4 5Cr4Mo3SiMnVAl ≤229 1090–1120 °C Oil 46
    4-5 3Cr3Mo3W2V ≤235 1075–1125 °C Oil 46
    4-6 5Cr4W5Mo2V ≤229 1090–1120 °C Oil 48
    4-7 8Cr3 ≤229 850–880 °C Oil 42
    4-8 4CrMnSiMoV ≤229 860–890 °C Oil 46
    4-9 4Cr3Mo3SiV ≤229 1000–1050 °C Oil 46
    4-10 4Cr5MoSiV ≤235 900 °C (salt bath) or 910 °C (controlled atmosphere) ± 6 °C, hold 5–15 min Air cool 54
    4-11 4Cr5MoSiV1 ≤235 900 °C (salt bath) or 910 °C (controlled atmosphere) ± 6 °C, hold 5–15 min Air cool 54
    4-12 4Cr5W2VSi ≤235 900 °C (salt bath) or 910 °C (controlled atmosphere) ± 6 °C, hold 5–15 min Air cool 54
    5-1 Non-magnetic die 7Mn15Cr2Al3V2WMo — Solution treatment at 1000–1050 °C Water 45
    6-1 Plastic mold 3Cr2Mo ≤229 — — 28–34
    6-2 Plastic mold 3Cr2MnNiMo ≤229 — — 34–38

    Notes to Table 3:

  • a) Tempering at 200 °C: one tempering cycle for 2 hours; at 550 °C: two tempering cycles, 2 hours each.
  • b) For controlled atmosphere hardening, the holding time at temperature is 5–15 min (10–20 min for Cr12Mo1V1).
  • c) Grade 7Mn15Cr2Al3V2WMo may be supplied in hot-rolled condition without delivery hardness testing.

    • 5.5 Microstructure

    5.5.1 Pearlite Structure

    5.5.1.1 Annealed 9SiCr, Cr2, CrWMn, 9CrWMn, Cr06, W and 9Cr2 steels shall be inspected for pearlite structure and assessed according to Level 1 chart of this standard. The acceptable grade is 1–5.

    5.5.1.2 Steels for hot-working do not require pearlite structure inspection. Upon purchaser’s request and by mutual agreement, annealed 9SiCr steel for threading tools shall have a pearlite structure grade of 2–4.

    5.5.2 Network Carbide

    5.5.2.1 Annealed CrWMn, Cr2, Cr06 and 9SiCr steels shall be inspected for network carbide and assessed according to Level 2 chart of this standard.

    For CrWMn, Cr2, Cr06 and 9SiCr steels with cross-section not exceeding 60 mm, the acceptable grade is not exceeding Level 3. Upon purchaser’s request and by agreement, annealed 9SiCr steel (≤60 mm) for threading tools shall not exceed Level 2.

    For flat bars and steels with cross-section greater than 60 mm, the acceptable grade shall be agreed upon between the supplier and the purchaser.

    5.5.2.2 Steels for hot-working do not require network carbide inspection.

    5.5.3 Eutectic Carbide Non-Uniformity

    5.5.3.1 Annealed Cr12, Cr12MoV, Cr12Mo1V1, 6W6Mo5Cr4V and 6Cr4W3Mo2VNb steels shall be inspected for eutectic carbide non-uniformity and assessed according to Chart 4 of GB/T 14979. The acceptable grades shall comply with Table 4.

    When the supplier guarantees compliance, 6Cr4W3Mo2VNb steel may be exempted from inspection.

    Upon purchaser’s request and by mutual agreement, Grade I supply group as shown in Table 4 may apply.

    ##### Table 4 — Acceptable Grades for Eutectic Carbide Non-Uniformity

    Steel Diameter or Thickness (mm) Acceptable Grade
    ≤50 3
    >50–70 4
    >70–120 5
    >120 6

    5.5.3.2 For flat bars, the acceptable grade of eutectic carbide non-uniformity shall be agreed upon between the supplier and the purchaser.

    5.6 Decarburization

    5.6.1 The total single-side decarburization depth (ferrite + transition zone) of hot-rolled and forged steels shall comply with Table 5. Upon purchaser’s request and by mutual agreement, Group I may apply. For cold-drawn steels, the total single-side decarburization depth, except for silicon-containing alloy steels, shall not exceed 1.5% of the nominal dimension; for silicon-containing alloy steels, it shall not exceed 2% of the nominal dimension. Bright steel surfaces shall not have any decarburization layer. The total decarburization depth for flat bars and steels with diameter (thickness) greater than 150 mm shall be agreed upon between the supplier and the purchaser.

    Table 5 — Total Decarburization Depth (mm)

    Steel Diameter or Thickness Total Decarburization Depth (not exceeding)
    Group I Group II
    >5–150 0.25 + 1% D 0.20 + 2% D

    Note: D = nominal cross-section dimension of the steel.

    5.6.2 The decarburization depth for 6W6Mo5Cr4V, 4Cr3Mo3SiV and 3Cr3Mo3W2V steels shall be agreed upon between the supplier and the purchaser.

    5.6.3 The non-magnetic die steel 7Mn15Cr2Al3V2WMo is not subject to decarburization testing.

    5.7 Magnetic Permeability

    The non-magnetic die steel 7Mn15Cr2Al3V2WMo shall have a magnetic permeability less than 1.01. When the supplier guarantees compliance, testing may be waived.

    5.8 Surface Quality

    5.8.1 Hot-rolled and forged steels for pressure working shall not have visually visible cracks, laps, scabs, or inclusions on the surface. If such defects exist, they must be removed. The removal depth from the actual dimension shall comply with Table 6. The removal width shall not be less than 5 times the depth. Other minor surface defects within half the tolerance may remain unremoved.

    Table 6 — Allowable Removal Depth (mm)

    Steel Diameter or Thickness Allowable Removal Depth (same cross-section)
    <80 Half tolerance
    80–140 Full tolerance
    >140 As agreed between supplier and purchaser

    5.8.2 Hot-rolled and forged steels for machining may have local defects not exceeding the depth specified in Table 7 from the nominal dimension.

    Table 7 — Allowable Depth of Local Defects (mm)

    Steel Diameter or Thickness Allowable Depth of Local Defects
    <80 Half tolerance
    >80 Full tolerance

    5.8.3 Cold-drawn steel surfaces shall be clean and free of scale and cracks. Slight oxidation color or light oxide layer is permitted. For cold-drawn steels of grades 9 and 10 precision, no surface defects are permitted. For grades 11 and 12 precision, minor surface defects such as pits, individual scratches, hairline cracks, scars, dark spots, tearing, and lubricant traces are permitted, provided the depth does not exceed the tolerance of the nominal dimension from the actual dimension. Upon purchaser’s request, the defect depth may not exceed half the tolerance of the nominal dimension. Bright steel shall comply with GB/T 3207.

    5.8.4 Surface quality of flat bars shall be agreed upon between the supplier and the purchaser.

    5.9 Special Requirements

    Upon purchaser’s request and by mutual agreement, the following additional inspection items may be added for alloy tool steels. Their test methods, number of tests, assessment criteria, and acceptable grades shall be agreed upon between the supplier and the purchaser and specified in the contract:

  • a) Non-metallic inclusions
  • b) Austenite grain size
  • c) Fatigue testing

    • 6 Test Methods

    The test methods for inspection items of steel shall comply with the provisions of Table 8.

    Table 8 — Test Methods

    No. Inspection Item ਮਾਤਰਾ Test Method Sampling Location
    1 ਰਾਸਾਇਣਿਕ ਬਣਤਰ 1 GB/T 222, GB/T 223 Corresponding to ingot head
    2 Macrostructure 1 GB/T 226 Different steel blooms or bars
    3 Decarburization 3 GB/T 224 Any end of the steel
    4 Brinell hardness 3 GB/T 231.1 Any end of the steel
    5 Rockwell hardness 2 GB/T 230 Any end of the steel
    6 Pearlite structure 2 GB/T 13298 Any end of the steel
    7 Network carbide 2 GB/T 13298 Any end of the steel
    8 Eutectic carbide non-uniformity 2 GB/T 13298 / GB/T 14979 Any end of the steel
    9 Magnetic permeability 1 Specified method Any end of the steel
    10 Shape, dimensions All Specified method —
    11 Surface All ਦ੍ਰਿਸ਼ਟੀਗਤ ਜਾਂਚ —

    7 Inspection Rules

    7.1 Inspection and Acceptance

    The inspection and acceptance of steel shall be conducted by the supplier’s quality inspection department.

    7.2 Batch Rules

    Steels shall be accepted in batches. Each batch shall consist of steels of the same grade, heat number, and specification, and shall be inspected and accepted in accordance with the relevant provisions.

    7.3 Resampling

    If any test result does not meet the standard requirements, resampling shall be performed in accordance with relevant provisions.

    7.4 Packaging and Marking

    Packaging, marking, and quality certificates shall comply with the provisions of GB/T 2101.

    Appendix A (Normative) — Reference Charts

    A1 — Level Chart 1: Pearlite Structure

    Charts depicting pearlite structure grades 1 through 6 are provided in the original standard as visual reference plates.

    A2 — Level Chart 2: Network Carbide

    Charts depicting network carbide grades 1 through 4 are provided in the original standard as visual reference plates.

    A3 — Level Chart 3: Macrostructure

    Charts depicting central porosity (grades 1–5) and ingot-type segregation (grades 1–5) are provided in the original standard as visual reference plates.

    Appendix B (Informative) — Comparison of Die and Mold Steel Grades

    No. GB/T 1299–2000 Grade US ASTM A681–1994 Equivalent
    1-6 W F1
    2-2 5CrW2Si S1
    2-4 6CrMnSi2Mo1V S5
    2-5 5Cr3Mn1SiMo1V S7
    3-1 Cr12 D3
    3-2 Cr12Mo1V1 D2
    3-4 Cr5Mo1V A2
    4-2 5CrNiMo L6
    4-3 3Cr2W8V H21
    4-9 4Cr3Mo3SiV H10
    4-10 4Cr5MoSiV H11
    4-11 4Cr5MoSiV1 H13
    6-1 3Cr2Mo P20
    6-2 3Cr2MnNiMo 718

    Document end — GB/T 1299-2000

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    GB/T 1299-2000 Alloy Tool Steels – Chinese National Standard

    📄 Original PDF: Download GB/T 1299-2000 Alloy Tool Steels (PDF) GB/T 1299-2000 — Alloy Tool Steels ICS 77.140.20 H 40 People’s Republic of China National Standard GB/T 1299–2000 Alloy Tool Steels Published: 2000-10-25 | Implemented: 2001-09-01 Issued by: State Bureau of Quality and Technical Supervision Foreword This standard is adopted non-equivalently from ASTM A681-1994 “Alloy […]

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    GB/T 6394-2002 — Metal Average Grain Size Rating Chart (English)

    GB/T 6394-2002 — Metal Average Grain Size Rating Chart Metallographic Structure Standard Atlas — Metal Average Grain Size Determination Chart GB/T 6394-2002 Series I — Non-Twinned Grains (Light Etching) ×100 Grain size grades ranging from 00 to 8, showing non-twinned austenite grains under light etching at 100× magnification. Grade 00 – Grade 2 Grade 2½ […]

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    Mechanical Engineering Material Testing Handbook

    ਮਕੈਨਿਕਲ ਇੰਜੀਨੀਅਰਿੰਗ ਮਟੀਰੀਅਲ ਟੈਸਟਿੰਗ ਹੈਂਡਬੁੱਕ – ਭੌਤਿਕ ਧਾਤੂ ਵਿਗਿਆਨ ਖੰਡ ਮੁੱਖ ਸੰਪਾਦਕ / Chief Editor: 桂立丰 (Gui Lifeng) ਖੰਡ ਸੰਪਾਦਕ / Volume Editor: 唐汝钧 (Tang Rujun) (Tang Rujun) ਸਮੱਗਰੀ ਸੰਖੇਪ / Overview ਇਹ ਹੈਂਡਬੁੱਕ ਮਕੈਨਿਕਲ ਇੰਜੀਨੀਅਰਿੰਗ ਵਿੱਚ ਧਾਤੂ ਸਮੱਗਰੀਆਂ ਦੀ ਭੌਤਿਕ ਧਾਤੁ-ਵਿਗਿਆਨ ਟੈਸਟਿੰਗ ਖੇਤਰ ਦੀ ਪ੍ਰਮੁੱਖ ਰੈਫਰੈਂਸ ਕਿਤਾਬ ਹੈ, ਜਿਸ ਵਿੱਚ ਧਾਤੂ ਸਮੱਗਰੀਆਂ ਦੇ ਸੂਖਮ ਸੰਰਚਨਾ ਵਿਸ਼ਲੇਸ਼ਣ, ਧਾਤੁ-ਵਿਗਿਆਨ ਨਮੂਨੇ ਦੀ ਤਿਆਰੀ, ਅਤੇ ਸੂਖਮ ਸੰਰਚਨਾ ਮੁਲਾਂਕਣ ਵਰਗੀਆਂ ਮੁੱਖ ਵਿਸ਼ਿਆਂ ਨੂੰ ਸ਼ਾਮਿਲ ਕੀਤਾ ਗਿਆ ਹੈ। […]

    Read 147 · Comments 0 • 2026-05-29