20crmo round spot in the co-metal

Product Name: 20CRMO Price: 7.3 yuan / KG Category: New Delivery: 1-3 days Release Date: March 26, 2015 Validity: Effective Delivery: Shanghai - Shanghai Brand: Steel Model: 20CRMO shipments: 1000000KG Delivery: 1-3 days Standard: GB / T 3077-1999 ● Features and Scope: high hardenability, no temper brittleness, weldability is quite good, very cold cracking tendency to form small, can be good machinability and cold strain plasticity. Usually in the quenching or carburizing state used for the manufacture of non-corrosive media penetration and temperature lower than 250 ℃, high pressure pipes and all kinds of fasteners containing nitrogen and hydrogen mixture of media work, more advanced carbon parts, such as gears, shafts, etc. ● Chemical Composition: Carbon C: 0.17 ~ 0.24 Si Si: 0.17 ~ 0.37 Mn Mn: 0.40 ~ 0.70 Sulfur S: to allow the residual phosphorus content ≤0.035 P: ≤0.035 allow the residual content of chromium Cr: 0.80 ~ 1.10 Ni: to allow the residual content ≤0.030 copper Cu: to allow the residual content of ≤0.030 Mo Mo: 0.15 ~ 0.25 ● Mechanical Properties: Tensile strength σb (MPa): ≥885 (90) yield strength σs (MPa): ≥685 (70) Elongation δ5 ( %): ≥12 section shrinkage ψ (%): ≥50 impact energy Akv (J): ≥78 impact toughness αkv (J / cm2): ≥98 (10) Hardness: ≤197HB sample size: Sample blank size is 15mm ● Heat treatment and microstructure: heat treatment specifications: quenching 880 ℃, water, oil cooling; tempering 500 ℃, water, oil cooling. ● Delivery status: to heat treatment (normalizing, annealing or tempering) or without heat treatment delivery, the delivery status should be specified in the contract.