30crnimo8

Chemical Composition (%)

C(％)	Si(％)	Mn(％)	P(％)	S(％)	Cr(％)	Ni(％)	Cu(%)
0.14～0.22	≤0.30	0.30～0.65	≤0.045	≤0.050	≤0.30	≤0.30	≤0.30

Mechanical Properties

	Min.	Max.	Approx
Castings; Homogenization, Solution and Precipitation Heat Treated (H1100); separately cast test pieces
Yield stress Rp0,2 (MPa)	827	-	-
Tensile stress, Rm (MPa)	896	-	-
Elongation, A (%)	10.0	-	-
	Elongation in 4 x Diameter %
Impact, Kv/Ku (J)	-	-	-
Hardness
	HR min	HR max
	30	38
	HRC
Castings; Homogenization, Solution and Precipitation Heat Treated (H1100); Integrally cast specimens
Yield stress Rp0,2 (MPa)	827	-	-
Tensile stress, Rm (MPa)	896	-	-
Elongation, A (%)	6.0	-	-
	Elongation in 4 x Diameter %
Impact, Kv/Ku (J)	-	-	-
Hardness
	HR min	HR max
	30	38
	HRC

Mechanics performance

The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | ≤ 16:235
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 16 ~ 40:225
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 40 to 60:215
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 60 ~ 100:205
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 100 ~ 150:195
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 150:185

Cold bending property

Sample direction: vertical
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | than 60: d = a
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | > 60 ~ 100: d = 2 a
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | > 100 ~ 200: d = 2.5 a

Performance characteristics and applications

Good strength and cold, heat pressure processing performance sex and welding is a bit poor performance.
Widely used in the manufacture of sheet, steel bar, steel structure with all kinds of steel, building structure, Bridges, engine, mechanical parts, carburizing or carbon nitrogen were permeability parts, components, support, force not big pole, connecting rod, pin, shaft, screw, nut, rings, etc
 

 

GB/T 700-1988 standard and GB 700-1979 standard steel grade comparison

GB/T 700-1988 standadr:

Regardless of rank, the chemical composition and mechanical properties (σ s, σ b, the delta and the cold bending) are to be guaranteed

Rolling plate and rod of products, the mechanical properties of the guarantee condition, can according to product characteristics and application requirements, in the standard separately

GB 700-1979 standard

A1 the mechanical properties of the steel guarantee (σ s, σ b, the delta and the cold bending), B1 steel guarantee the chemical composition of the same with Q195

A1 steel cold bending test is additional guarantee conditions

1 no special steel of steel