GB/T 5216-2004 Translated English of Chinese Standard. (GBT 5216-2004, GB/T5216-2004, GBT5216-2004): Structural steels subject to end-quench hardenability requirements
https://www.chinesestandard.net, 2015 M01 25 - 44 pages
This standard specifies the steel dimensions, shape, weight and permissible tolerances, technical requirements, test methods, inspection rules, packaging, sign and quality certificate etc. of the hot rolling and hot forging structural steels subject to end-quench hardenability requirements. This standard is applicable to the hot rolling and forging structural steel bars of hardenability used in machinery manufacture with its diameter or thickness no less than 30 mm. The steel hardenability is determined by edge quenching or calculated by the formula.
Classification and Code Number
Change the primary Article 3 7 2 into the austenite grain size of the steel is not less than
Appendix A Informative Calculation Methods of Steel Hardenability
Appendix B Informative Comparison Table of Newlyadded Grades Listed in Table 1
20 Figure 20 HH Max 30 H Max Analysis of Iron annealing or high billet or steel calculated according calculation method carbon content Charpy Impact Test Chemical Analysis content mass fraction critical diameter D1 Determination of Nickel Different pieces Dimethylglyoxime Distanceaway end-quench hardenability End-quenching temperature 850±5 End-quenching temperature 925±5 end/mm Normalizing temperature ends bands eqv ISO Extraction Photometric Method form the quenched fromthe quenched end/mm Grade Gravimetric Method H band hardenability bands HRC HH Max 48 high-grade fine steel HL Max 46 homogeny ideal critical diameter listed distances listed distances mm macrostructure Methods for Chemical minimum hardness values Normalizing temperature 860~880 Normalizing temperature 915~935 Normalizing temperature 920~940 permissible variation Phosphorus Content GB/T pieces of steel quenched end/mm Distance quenched end/mm Normalizing quenched ends 1.5 Range of hardenability specified in Table Steel and Alloy steel bar GB/T steel billet Steel GB/T structural steel supply and purchaser unified numbering weight and permissible