Stainless steel: 3Cr13 Standard: GB / T 1220-1992 Features and Scope: martensitic stainless steel grades are commonly 1Cr13,3Cr13 etc., due to higher carbon, it has a high strength, hardness and wear resistance, but the resistance eclipse somewhat less, for high mechanical performance requirements, performance requirements for general corrosion on some parts, such as springs, turbine blades, for cutting tools, nozzle, valve seats, valve / hydraulic press valve. Such steel is after quenching, tempering use. Chemical Composition: Carbon C: 0.26 ~ 0.35 3Cr13 3Cr13 stainless steel silicon Si: ≤1.00 Mn Mn: ≤1.00 sulfur S: ≤0.030 phosphorus P: ≤0.035 chromium Cr: 12.00 ~ 14.00 Ni: to allow contains ≤0.60 Mechanical Properties: Anti- tensile strength σb (MPa): quenching and tempering, ≥735 Conditions yield strength σ0.2 (MPa): quenching and tempering, ≥540 Elongation δ5 (%): quenching and tempering, ≥12 section shrinkage ψ (%) : quenching and tempering, ≥40 impact energy Akv (J): quenching and tempering, ≥24 Hardness: annealing, ≤235HB; quenching and tempering, ≥217HB heat treatment and microstructure specifications: Heat treatment specifications: 1) annealing, 800-900 ℃ slow cooling or rapid cooling to about 750 ℃; 2) quenching, 920 ~ 980 ℃ oil cooling; 3) tempering, 600 ~ 750 ℃ ??rapid cooling. Microstructure: Organizing for the martensitic. Delivery status: generally heat treatment delivery, the treatment types specified in the contract; not indicated, by not heat treatment delivery.