📄 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 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.	Klasse	Unified No.	C	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.	Klasse	Unified No.	C	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.	Klasse	Unified No.	C	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.	Klasse	Unified No.	C	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.	Klasse	Unified No.	C	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.	Klasse	Unified No.	C	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	Klasse	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	Menge	Test Method	Sampling Location
1	Chemische Zusammensetzung	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	Visuelle Kontrolle	—

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