SNC631 Structural Steel Bar

 

SNC631 is carbon steel quenched and tempered steel. With high strength, high toughness and high hardenability. In the quenched and tempered state, the comprehensive mechanical properties are good, low temperature impact toughness good. Temper brittle tendency, easy to produce cracks in water. Machinability is good, but poor weldability. Used in quenched and tempered condition. 

 

Chemical Composition:

 

C(％)Si(％)Mn(％)P(％)S(％)Cr(％)Ni(％)Cu(％)
0.27～0.350.15 ~ 0.350.35 ~ 0.65≤0.030≤0.0300.60～1.002.50 ~ 3.00≤0.30

 

Mechanical Propoerties:

 

Yield Strength
Rp0.2(MPa)		Tensile Strength
Rm(MPa)		Elongation δ5 (%): Reduction
of area ψ (%):		Impact energy
Akv (J):		Impact toughness
value αkv (J/cm2)		 Hardness
≥ 785(80) ≥ 980(100) ≥ 9≥ 45≥ 63≥ 78(8)≥ 241 HB

 

Application:

 

Manufacture important quenched and tempered parts with large cross-sectional dimensions for forging and cold stamping, such as connecting rods, discs, crankshafts, gears, shafts, screws, etc.


Heat treatment:

  • quenching 820 ℃, oil cooling; 
  • tempering 500 ℃, water-cooled, oil-cooled. 

 

Delivery:

To heat treatment (normalizing, annealing or tempering) or not heat treatment delivery.

 

 

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