35Cr 

 Chemical composition 
 35cr welding 35Cr [1], alloy structural steel. Uniform digital code: A20352 
 Chemical composition 
 Standard: GB / T 3077-1988] [chemical composition (mass fraction) (%) C C: 0.32 ~ 0.39 Si Si: 0.17 ~ 0.37 Manganese Mn: 0.50 ~ 0.80 S S: to allow the residual phosphorus content ≤ 0.035 P: allow the residual chromium content ≤ 0.035 Cr: 0.80 ~ 1.10 
 Ni: to allow the residual content ≤ 0.030 Copper Cu: ≤ 0.030 to allow the residual content 
 [Mechanical Properties] sample blank size (mm): 25 Heat treatment: first quenching temperature (℃): 860; Coolant: Oil second quenching temperature (℃): - tempering heating temperature (℃): 500 ; coolant: water, oil tensile strength σb (MPa): ≥ 930 (95) yield strength σs (MPa): ≥ 735 (75) Elongation δ5 (%): ≥ 11 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): ≦ 207 Delivery status: heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract. [Main Features] This steel and 30Cr steel with the strength and toughness are higher in carbon alloy quenched and tempered steel, ultimate strength grade 35 steel than the corresponding 20%, slightly higher hardenability than 30Cr, and 30Cr and other process performance similar. [Application examples] for the manufacture of gears, shafts, rollers, bolts and other important pieces of quenched and tempered, uses basically the same with 30Cr 
 35cr welding 
 1, generally in the annealed (normalized) state welding. 2, 3 welding method is not restricted, with the larger line energy, appropriately increasing the preheat temperature, preheat temperature and the layer normal temperature can be controlled between 250 ~ 300 ℃. 4, the welding material should ensure that the composition of deposited metal with the same base material, such as the J107-Cr 5, post-weld heat treatment should be promptly quenched. If timely quenched difficult, can be intermediate annealing or preheating temperatures above the heat for some time, to exclude the diffusion of hydrogen and soften the tissue. On the complex structure, the weld more products in the welding seam after a certain number of finished, intermediate annealing conducted