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GB/T 1299-2014 English PDF (GBT1299-2014)

GB/T 1299-2014 English PDF (GBT1299-2014)

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GB/T 1299-2014: Alloy tool steels

This standard specifies the classification, ordering content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of tool and mould steel. This standard is applicable to hot-rolled, forged, cold-drawn, bright steel bar and post-machining delivered steel for tool and mould. The chemical composition is also applicable to ingots, billets, their products.
GB/T 1299-2014
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.35
H 40
Replacing GB/T 1299-2000, GB/T 1298-2008
Tool and mould steels
ISSUED ON. DECEMBER 05, 2014
IMPLEMENTED ON. SEPTEMBER 01, 2015
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
1 Scope ... 7
2 Normative references ... 7
3 Classification ... 11
4 Ordering content ... 12
5 Size, shape, weight ... 12
5.1 Size, shape, allowable deviation of hot-rolled steel bars and coil rods ... 12 5.2 Size, shape, allowable deviation of forged steel bars ... 16
5.3 Size, shape, allowable deviation of cold-drawn steel bar ... 18
5.4 Size, shape, allowable deviation of bright steel bar ... 18
5.5 Size, shape, allowable deviation of post-machining delivered steel ... 18 5.6 Weight ... 19
6 Technical requirements ... 19
6.1 Designations and chemical composition ... 19
6.2 Smelting methods ... 26
6.3 Delivery status ... 26
6.4 Delivery hardness ... 27
6.5 Macrostructure ... 32
6.6 Microstructure ... 33
6.7 Non-metallic inclusions ... 35
6.8 Decarburization layer ... 36
6.9 Relative magnetic permeability ... 37
6.10 Ultrasonic testing ... 37
6.11 Surface quality... 38
6.12 Special requirements ... 39
7 Test methods ... 40
8 Inspection rules ... 40
8.1 Inspection and acceptance ... 40
8.2 Group-batch rules ... 40
8.3 Sampling quantity and sampling locations ... 40
8.4 Reinspection and judgement rules ... 42
9 Packaging, marking, quality certificate ... 42
Appendix A (Normative) Standard rating chart ... 43
Appendix B (Normative) Test method of hardenability of non-alloy tool steel 49 Appendix C (Informative) Main features and purposes of each designation .. 52 Appendix D (Informative) Comparison of designation of tool and mould steel between domestic and international standards ... 65
Tool and mould steels
1 Scope
This standard specifies the classification, ordering content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of tool and mould steel.
This standard is applicable to hot-rolled, forged, cold-drawn, bright steel bar and post-machining delivered steel for tool and mould. The chemical
composition is also applicable to ingots, billets, their products.
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard.
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.8 Methods for chemical analysis of iron, steel and alloy - The sodium fluoride separation-EDTA titration method for the determination of aluminum content
GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
GB/T 223.13 Methods for chemical analysis of iron, steel and alloy - The ammonium ferrous sulfate titration method for the determination of vanadium content
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The N- Benzoy-N-Phenylhydroxylamine extraction photometric method for the
determination of vanadium content
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation iodimetric method for the determination of copper content
GB/T 223.19 Methods for chemical analysis of steels and alloys - The 2,9- dimethyl-1,10-phenanthroline-trichloromethane extractive
spectrophotometric for the determination of copper content
GB/T 223.22 Methods for chemical analysis of iron, steel and alloy - The nitroso-R-salt spectrophotometric method for the determination of cobalt content
GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method
GB/T 223.28 Methods for chemical analysis of iron, steel and alloy - The ??- benzoin oxime gravimetric method for the determination of molybdenum
content
GB/T 223.29 Iron steel and alloy - Determination of lead content - Carrier precipitation-xylenol orange spectrophotometric method
GB/T 223.31 Iron steel and alloy - Determination of arsenic content -
Distillation-molybdenum blue spectrophotometric method
GB/T 223.43 Iron steel and alloy - Determination of tungsten content -
Gravimetry method and spectrophotometric method
GB/T 223.47 Method for chemical analysis of iron, steel and alloy - The carrier precipitation-molybdenum blue photometric method for the
determination of antimony content
GB/T 223.48 Methods for chemical analysis of iron, steel and alloy - The semixylenol orange photometric method for the determination of bismuth
content
GB/T 223.50 Methods for chemical analysis of iron, steel and alloy - The phenylfuorone-CTMAB direct photometric method for the determination of
tin content
GB/T 223.53 Methods for chemical analysis of steels and alloys - The flame atomic absorption spectrophotometry for the determination of copper
content
GB/T 223.54 Methods for chemical analysis of steels and alloys - The flame atomic absorption spectrophotometry for the determination of nickel content GB/T 223.58 Methods for chemical analysis of steels and alloys - The
sodium arsenite-sodium nitrite titration for the determination of manganese content
GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony
GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace
GB/T 224 Determination of depth of decarburization of steels
GB/T 225 Steel - Hardenability test by end quenching (Jominy test)
GB/T 226 Test method for macrostructure and defect of steel by etching
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1. Test method (scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1. Test method GB/T 702-2008 Hot-rolled steel bars - Dimensions, shape, weight and
tolerances
GB/T 905-1994 Rubber and plastics hose - Determination of adhesion
between components
GB/T 908-2008 Forged bars - Dimensions, shape, weight and tolerances
GB/T 1979-2001 Standard diagrams for macrostructure and defect of
structural steels
GB/T 2101 General requirement of acceptance packaging marking and
certification for section steel
GB/T 3207-2008 Bright steel
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element
contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 6402-2008 Steel forgings - Method for ultrasonic testing
GB/T 6394 Metal - Methods for estimating the average grain size
GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standard diagrams
GB/T 11261 Steel and iron - Determination of oxygen content - The pulse heating inert gas fusion-infra-red absorption method
GB/T 13298 Inspection methods of microstructure for metals
GB/T 14979-1994 Eutectic carbide of steel - Micrographic method using
Standard diagrams
2) Cold-pressure processing, UCP.
b) Steel for cutting work, UC.
The method of using and processing the steel shall be as stated in the contract. 3.3 Steel is divided into four categories according to their chemical composition. a) Non-alloy tool steel (designation headed with ?€?T?€?);
b) Alloy tool steel;
c) Non-alloy mould steel (designation headed with ?€?SM?€?);
d) Alloy mould steel.
Note. Non-alloy tool steel is the original carbon tool steel.
4 Ordering content
Contracts or orders for steel ordered under this standard shall include at least the following.
a) Standard number;
b) Product name;
c) Designation;
d) Smelting methods (see 6.2);
e) Delivery status;
f) Size and group of allowable deviation (see clause 5);
g) Processing methods used (see 3.2);
h) Other special requirements (see 6.12).
5 Size, shape, weight
5.1 Size, shape, allowable deviation of hot-rolled steel bars and
coil rods
5.1.1 Hot-rolled round-steel and square-steel
weight and whose length is not less than 500 mm. When delivered in fixed- length or multiple-length, the length shall be indicated in the contract and the allowable deviation of length shall be mm.
5.2.2.4 The plane curvature of the forged flat-steel shall be not more than 5.0 mm per meter, the total plane curvature shall not be more than 0.50% of the total length; the side curvature of the flat-steel (camber) shall be not more than 5.0 mm per meter, the total side curvature (camber) shall be not more than 0.50% of the total length.
5.2.2.5 For flat-steel which has a nominal thickness or width of not more than 300 mm, the fillet radius R at the edge and corner shall be not more than 5.0 mm; for flat-steel which has a nominal thickness or width of more than 300 mm, the fillet radius R at edge and corner shall not be more than 10.0 mm, but the difference of the lengths of the two diagonals on the same cross-section of the flat-steel shall be not more than the tolerance of its nominal width. Flat-steel does not allow significant torsion.
5.2.2.6 Both ends of the forged flat-steel shall be cut straightly.
5.3 Size, shape, allowable deviation of cold-drawn steel bar
The size, shape, allowable deviation of the cold-drawn steel bar shall comply with the grade-h11 of GB/T 905-1994. If the purchaser requires size tolerances of other groups, it shall be indicated in the contract.
5.4 Size, shape, allowable deviation of bright steel bar
The size, shape, allowable deviation of the bright steel bar shall comply with the grade-h11 of GB/T 3207-2008. If the purchaser requires the size tolerances of other groups, it shall be indicated in the contract.
5.5 Size, shape, allowable deviation of post-machining
delivered steel
5.5.1 The allowable deviation of the sizes of machined steel shall comply with the requirements of Table 10. If the purchaser requires the allowable deviations of other sizes, it shall be indicated in the contract.
6.8.5 The decarburization layers of steels 6W6Mo5Cr4V, 4Cr3Mo3SiV and
3Cr3Mo3W2V shall be determined between the supplier and purchaser through negotiation.
6.8.6 7Mn15Cr2Al3V2WMo non-magnetic mould steel is free from testing of the decarburization layer.
6.9 Relative magnetic permeability
The relative magnetic permeability of 7Mn15Cr2Al3V2WMo non-magnetic
mould steel shall be less than 1.01. When the supplier guarantees that this requirement is met, it may not be tested.
6.10 Ultrasonic testing
6.10.1 Steel shall be ultrasonically tested according to GB/T 6402, it is not allowed for metallurgical defects such as white spots, slag inclusions, delamination, internal cracks, shrinkage cavities inside.
6.10.2 The grading and quantity grade of the allowed limit values of ultrasonic testing shall be as specified in Table 36 and Table 37, respectively. The qualification grade shall comply with the requirements of group-2 in Table 38, but the high-quality steels such as electroslag remelted steel shall comply with the requirements of group-1.
6.10.3 The qualification grade of ultrasonic testing for special-purpose mould steel shall be determined between the supplier and purchaser through
negotiation.
Table 36 -- Limit size of allowable defects of ultrasonic testing
Grade of
defect size
Single-defect flat-bottom
hole?€?s diameter a, mm
Continuous-defect flat-
bottom hole?€?s diameter b, mm
Maximum length of continuous-
defect c, mm
A 14 10 80
B 10 7 60
C 7 5 40
D 5 3 30
E 3 2 30
a Depending on the grade of defect size as required for the order, the distance of a single-defect?€?s diameter shall be greater than or equal to 5 times the diameter of the required flat-bottom hole; otherwise the defect is considered as a continuous-defect.
b The grade of defect size of the flat-bottom hole shall have a 6 dB amplitude. c If the maximum continuous-defect?€?s length exceeds the standard grade, it may consider increasing the quantity grade. For example, if the continuous length of the defect is 160 mm grade-A, the quantity grade is 160.80= 2.
Table 40 -- Requirements of surface quality of steel for cutting-work
Unit in millimeters
Diameter, side length, thickness or width of steel Allowable depth of local defect, not more than < 80 Half of tolerance
??? 80 Tolerance
6.11.3 The surface of cold-drawn steel shall be clean and smooth, free of cracks, folds, crusting, inclusions or scales, meanwhile it shall comply with the following requirements.
a) For the cold-drawn steel which has a grade of dimensional accuracy of h9 and h10, the surface is not allowed to have any defects;
b) For the cold-drawn steel which has a grade of dimensional accuracy of h11 and h12, the surface is allowed to have such minor surface defects
as pitting, individual scratches, hairline, concave, black spot, cracking, lubrication mark which has a depth not exceeding the tolerance of nominal size, as calculated from the actual size. As required by the purchaser and indicated in the contract, the allowable depth of defect may be not more than half of the tolerance of this nominal size;
c) For the heat-treated cold-drawn steel, it is allowed for the surface to have an oxidized color or slightly-oxidized layer.
6.11.4 The surface of bright steel shall comply with the provisions of GB/T 3207- 2008.
6.11.5 The surface of the steel as delivered after machining shall be clean and smooth, there shall be no cracks, folds, crusted or iron-oxidized skin. If the above defects exist, it allows partial grinding, but it shall guarantee the minimal size of the steel at the position of maximum grinding.
6.12 Special requirements
As required by the purchaser, agreed between the supplier and purchaser, indicated in the contract, it may add the following testing items.
a) Special chemical composition;
b) Special hardness values;
c) Special sizes and their allowable deviations;
d) Grain size;
e) Hardenability;
f) Other requirements.
7 Test methods
The inspection items and test methods for each batch of steel shall comply with the requirements of Table 41.
8 Inspection rules
8.1 Inspection and acceptance
The quality of the steel is inspected and accepted by the supplier's technical quality supervision department. The purchaser has the right to inspect and accept any of the inspection items as specified in this standard or contract. 8.2 Group-batch rules
8.2.1 Steel shall be accepted in batches. Each batch of steel shall consist of steel of the same heat number, the same processing method, the same delivery status, the same specification, the same heat-treatment number.
8.2.2 Each batch of electroslag remelted steel shall consist of steels of the same sub-furnace number, the same processing method, the same delivery status, the same specification, the same heat-treatment number. Under the condition that the process is stable and the requirements of this standard can be guaranteed, it is allowed to group-batch by the parent furnace number of electroslag remelting, but it shall take 1 specimen from each sub-furnace number in terms of chemical composition, the other items shall follow the sampling requirements of arc furnace steel.
8.3 Sampling quantity and sampling locations
The sampling quantity and sampling location of the steel shall comply with Table 41.
Appendix C
(Informative)
Main features and purposes of each designation
The main features and purposes of each designation are as shown in Table C.1 ~ Table C.7.
Table C.1 -- Main features and purposes of non-alloy steel for cutting
tool and mould
S/N
Unified
numeric
code
Designation Main features and purposes
1-1 T00070 T7
Hypo-eutectoid steel, which has a good plasticity, toughness and strength, as well as a certain hardness, can withstand shock and impact loads, but it is poor in machinability. It is used to manufacture tools that are not subjected to high shock loads and require excellent hardness, good wear-resistance, toughness.
1-2 T00080 T8
Hardenability and toughness are better than T10 steel, wear-resistance is also high, but quenching heating is easy to overheat, deformation is also large, plasticity and strength are relatively low, mould of large-and-medium cross- section tend to remain network carbide, which is suitable for small size drawn, tensioned, extruded mould
1-3 T01080 T8Mn
Eutectoid steel, which has high hardenability and hardness, but low plasticity and strength. It is used for manufacturing woodworking tools, hand-saw blades, stamp-marking tools, rivet mould, coal-mine chisel, etc., which has relatively large cross-section
1-4 T00090 T9
Hypereutectoid steel, which has a higher strength but lower plasticity and strength. Used in the manufacture of tools that require high hardness and toughness, such as stamp-marking tools, rivet mould, punches, woodworking tools, rock-drilling tools, etc.
1-5 T00100 T10
Non-alloy tool steel, which has better performance, high wear-resistance, low heat sensitivity during quenching, high strength and certain toughness after proper heat-treatment, suitable for manufacture of mould of high wear-resistance and low impact load
1-6 T00110 T11
Hypereutectoid steel, which has good comprehensive mechanical properties (such as hardness, wear-resistance and toughness), has little sensitivity to grain growth and formation of carbide network during heating. Used to manufacture tools whose cutting blades do not heat during cutting, such as saws, taps, trowels, scrapers, reamers, screw mould, cold-punching mould and woodworking tools which have a small size and no sharp change in cross-section
1-7 T00120 T12 Hypereutectoid steel which, because of its high carbon content, has more excess carbides after quenching, so it has high hardness and wear-resistance, but low

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