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GB/T 9943-2008 High-speed tool steels

Standard Number:  GB/T 9943-2008
Title:  High-speed tool steels
Language:  Simplified Chinese
Publication Date:  2008/5/13
Execute Date:  2008/11/1
Adopted International Standard:  ISO 4957:1999
Status:  Current
Standard Type:  Product
International Classification for Standards (ICS)METALLURGY>>Iron and steel products>>Tool steels
Publisher:  Chinese Standards(GB)
Price:22.80  
Number of Pages:20  

Preface: This standard and ISO4957:1999 tool steel, the degree of consistency is not equivalent. Instead of this standard GB/T4462-1984 high speed tool steel large carbide rating chart, GB/T 9942-1988 High speed tool steel forged bars with large section--Technical requirements compared with the main changes are as follows: - standard name changed to "high speed tool steel"; - increased the content of order terms (see chapter 3). - increases the classification clause (see chapter 4); - size, shape, weight Quantity and allowable deviation accordance with the provisions of the corresponding national standard specific precision group makes no special provision, and an increase in both sides negotiate content (1988 version of the chapter 3, this chapter 5). - delete the brand W18CR4VCO5 and W18CR4V2CO8 and related requirements; To increase brand W3MO3CR4 V2, W4MO3CR4VSI, W2MO8CR4V, W6MO6CR4V2, W6MO5CR4V4, W6MO5CR4V3CO8, W10MO4CR4V3CO10 a total of seven grades and related requirements (1988 version of the chapter 4, this version of chapter 6); - to W18CR4V, W2MO9CR4V2, CW6MO5CR4V2, W6MO5CR4V3, CW6MO5CR4V3, W6MO5CR4V2CO5, part W6MO5CR4V2AL brand elements, the chemical composition of the modified (1988 version of the table 3, this version of table 1 ); - tuned in high speed tool steel tungsten molybdenum two relations, namely the molybdenum content more than 0.30% of the parts, to every 1% instead of 2.0% molybdenum tungsten,... Modified tungsten, molybdenum 1% instead of 1.8% per... Note in table 3 (4) (1988 edition, this version of the paragraph) in table 1. By the steel - smelting method should be Using electric furnace or other appropriate method is modified to steel smelting electric furnace and electroslag remelting method should be adopted (1988 version of the article 4.2, this version of the article 6.2); Modified the part of the brand - hardness index, heat treatment system, cancels other hardness value processing method, sample quenching tempering hardness if the supplier can guarantee not inspection rules (1 988 version of the table 5, this version of table 3); - eutectic carbide is not uniformity test reference standard of GB/T 14979, and cancel the original GB/T 9943-1988 and GB/T9942-1988 standard of the communist party of China silicon carbide is not uniformity rating images (version of article 4.6 and 1988 The first and second level diagram, this version of the article 6.6); - increase provisions on wire rod surface quality (see 6.8.3); - increase electroslag steel group of rules and the requirements of the sampling number and sampling location (see 8.2); - increase the eutectic carbide is not uniformity and the test result of the non-metallic inclusion allowed to grey Materials, by a large generation rules (see 8.4.2); To GB/T4462-1984 "large high-speed tool steel carbide rating chart" as appendix A of this standard, and remove the wire, molybdenum tungsten molybdenum instead (see appendix A). Basic requirements - to increase high speed tool steels (see appendix B). Attached to this standard To record A normative appendix, appendix B for informative appendices. This standard put forward by the China iron and steel association. This standard by the national standardization technical committee under centralized steel. This standard main drafting unit: the northeast special steel group co., LTD., the smelting technology co., LTD., chongqing donghua special steel co., LTD and the metallurgical industry information Prospective research institute. Main drafter of this standard: Kang Ge, li-zhi wu, LuanYan, yun, Xie Jinggong, Zhang Zhanpu, GuJiang, Liu Baoshi. All previous releases of this standard replaced standards: GB/T4462-1984; GB/T9942-1988; - GB/T9943 -1988  
Description:Instead of this standard gb/t4462-1984 high speed tool steel large carbide rating chart, gb/t9942-1988 "high speed tool steel forging large section steel technical conditions" and gb/t9943-1988 "high-speed tool steel bar technology conditions". This standard specifies the size and shape of high speed tool steel and allowable deviation, technical requirements, test methods, inspection rules, packaging, mark and quality certificate, etc. This standard and gb/t9943-1988 compared with the main changes are as follows:
- standard name changed to "high speed tool steel";
- increases the "content" order terms (see chapter 3).
- increases the "classification" clause (see chapter 4);
- size, shape, weight and allowable deviation accordance with the provisions of the corresponding national standard specific category makes no special provision, precision and increase With both sides talks things over content (1988 version of the chapter 3, this version of chapter 5).
- delete brand w18cr4vco5 and w18cr4v2co8 and related requirements; To increase brand w3mo3cr4v2, w4mo3cr4vsi, w2mo8cr4v, w6mo6cr4v2, w6mo5cr4v4, w6mo5cr4v3co8, w10mo4cr 4 v3co10, a total of seven grades and related requirements (1988 version of the chapter 4, this version of chapter 6);
- to w18cr4v, w2mo9cr4v2, cw6mo5cr4v2, w6mo5cr4v3, cw6mo5cr4v3, w6mo5cr4v2co5, part w6mo5cr4v2al brand elements, the chemical composition of the modified (1988 version of the table 3, This version of table 1);
- tuned in high speed tool steel tungsten molybdenum two relations, namely the molybdenum content more than 0.30% of the part, will be "every 1% molybdenum instead of
2.0% tungsten,..." Changed to "each 1% instead of 1.8% molybdenum tungsten,..." Note in table 3 (4) (1988 edition, this version of the paragraph) in table 1.
- smelting method by "steel should be used in electric furnace or other appropriate method" changed to "steel Smelting electric furnace and electroslag remelting method should be adopted "(1988 version of the article 4.2, this version of the article 6.2);
- modified the part of hardness index, heat treatment system, cancel the other processing methods hardness value, increase sample quenching tempering hardness can not check if the supplier can guarantee provisions (1988 version of the table 5, this version of the table 3).
- eutectic carbide is not uniformity test reference gb/t 14979 standard gauge , and cancel the original gb/t 9943-1988 and gb/t9942-1988 standard of the communist party of China silicon carbide is not uniformity rating images (1988 version of article 4.6 and the first and second level
figure, this version of the article 6.6);
- increase provisions on wire rod surface quality (see 6.8.3);
- increase electroslag steel group of rules and the requirements of the sampling number and sampling location (see 8.2);
- increases the eutectic carbide is not uniformity and the test result of the non-metallic inclusion allowed with grey generation, with big small "rules (see 8.4.2);
- - to gb/t4462-1984 "high speed tool steel large carbide rating chart" as appendix a of this standard, and remove the wire words
sample, instead of molybdenum tungsten molybdenum (see appendix a).
- increasing high speed tool steels The basic requirements (see appendix b).  
Cross References:,(),,,
GB/T223.5
GB/T223.8 EDTA
GB/T223.11
GB/T223.13
GB/T223.19 
GB/T223.20
GB/T223.22 R
GB/T223.23
GB/T223.26
GB/T223.28 Α
GB/T223.43
GB/T223.53
GB/T223.54
GB/T223.58 
GB/T223.59
GB/T223.60
GB/T223.62
GB/T223.63
GB/T223.64
GB/T223.65
GB/T223.66 
GB/T223.67
GB/T223.68
GB/T223.69
GB/T223.72
GB/T223.76
GB/T224 (GB/T 224-1987 Determination of depth of decarburization of steel,EQVISO3887:1976)
  
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Tile in English:  High-speed tool steels

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