35SiMn 

 Grade: 35SiMn Material: Alloy Steel Unified Digital Code: A10352 Standard: GB / T 3077-1988 
 Chemical composition 
 [Chemical composition] (wt) (%) 
 35SiMn alloy steel 
 Carbon C: 0.32 ~ 0.40 Si Si: 1.10 ~ 1.40 Manganese Mn: 1.10 ~ 1.40 S S: to allow the residual phosphorus content of ≤ 0.35 P: ≤ 0.35 to allow the residual content of chromium Cr: to allow the residual content of ≤ 0.30 Ni: to allow the residual content of ≤ 0.30 Copper Cu: ≤ 0.30 to allow the residual content 
 Mechanical Properties 
 [Mechanical Properties] sample blank size (mm): 25 Heat treatment: first quenching temperature (℃): 900; coolant: water second quenching temperature (℃): - tempering heating temperature (℃): 570 ; coolant: water, oil tensile strength σb (MPa): ≥ 885 (90) yield strength σs (MPa): ≥ 735 (75) Elongation δ5 (%): ≥ 15 Reduction of area ψ (%): ≥ 45 Impact energy Akv (J): ≥ 47 impact toughness αkv (J/cm2): ≥ 59 (6) Brinell hardness (HBS100/3000) (annealing or tempering state): ≦ 229 Delivery status: heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract. 
 Key Features 
 [Main features] This is a better performance, more economical alloy quenched and tempered steel. Hardenability, good in water up to the critical quenching diameter 24 ~ 47.5mm, in the critical oil quenching diameter 11 ~ 27.5mm, tempered high strength and wear resistance and good toughness and stamina strength, which can be cut is also good, cold plastic deformation of the middle; but poor welding, heat treatment has tendency to temper brittleness, little decarburization, and have white spots and thermal sensitivity. This compared to steel and 40Cr steel, where the cross section 60mm below the quenched parts, in addition to low temperature (-20 ℃ or less)? Shock value a bit weak, the other properties are quite with it. 
 Application examples 
 [Application examples], mainly in the steel quenched and tempered condition for the manufacture of medium speed, medium load parts; or quenching and tempering conditions for high-load and the impact of small parts, but can be used as a large cross-section and the need for surface hardening of parts. In the general machinery industry, the steel for the manufacture of transmission gears, spindle, spindle, shaft, rod, worm, electric axle, generator shaft, crankshaft, flywheel and the size of the forgings; in the manufacture of steam turbines, as the working temperature below 400 ℃, less than 250mm in diameter and wheel spindle, the thickness of 170mm below the impeller and a variety of important fasteners; agricultural machinery in order to create more shovel hoe handle, plow House and other wear parts. Also be used as a thin-walled seamless steel tubes. This steel can be completely replaced for quenched and tempered steel 40Cr, also part of the steel instead of 40CrNi