ML30 ● Mechanical Properties: Tensile strength σb (MPa): ≥490 (50) Yield strength σs (MPa): ≥294 (30) Elongation δ5 (%): ≥21 section shrinkage ψ (%): ≥50 Hot-rolled hardness :() ≤179HB ML40 complete specifications, indentation diameter ≥4.5mm ● Heat treatment and microstructure: heat treatment specifications: AC3 is heated to a relatively high temperature is the critical point of 30 ~ 50 ℃, holding time less than 30min, air cooling. 37CrB1E cold heading steel development of cold heading steel production has achieved initial results, but the quality remains to be further improved. Understanding and knowledge of domestic and international cold heading steel production technology ML40, under heavy steel company's existing production equipment conditions, the successful experience of other chemical components ML40 steel, in the production process adhere to optimize the entire process of cold heading steel steps technical regulations, hot metal pretreatment, smelting, ladle refining, continuous casting machine casting, strengthen billet heating, intermediate rolling, spinning temperature control, in strict accordance with standards, the market can produce the required performance of cold heading steel. Factory direct ML40, ML40, Suzhou, Suzhou, the same is provided by the same metal material Limited. Suzhou, with Metal Materials Co. (www.szrtjs.com) located in Wuzhong District, Suzhou City Pu Town and Xi Road No. 1238 (Puyang intersection). Scraps and development in the wave of market economy, the current Suzhou, with has a high profile in the metal building, and enjoys a good reputation. Suzhou, get the whole network business alliance with certification, marking our service and management level has reached a new height. Suzhou, with the staff willing to work with all people of insight and common development, for a better future.