30crnimo8

Chemical Composition (%)

C(％)	Si(％)	Mn(％)	P(％)	S(％)	Cr(％)	Ni(％)	Cu(%)
0.06～0.12	≤0.30	0.25～0.50	≤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 | ≤ 16:195
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 16 ~ 40:185

Tensile strength σ b/MPa: 315 ~ 430
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | than 16:33
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 16 ~ 40:32
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 40 to 60:-
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 60 ~ 100:-
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 100 ~ 150:-
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 150:-
Impact test (1) | temperature / ℃ :-
Impact test (1) | impact absorption power AKV/J:- 

Cold bending property

Sample direction: vertical
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | than 60:0
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | > 60 ~ 100:-
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | > 100 ~ 200:-

Performance characteristics and applications 

High plasticity and toughness and welding performance, good pressure processing performance, but low strength. 
Load small parts, spacers, rivets, the anchor bolt, colter, funnel, roof, low carbon steel wire, plates, welded pipe, bars, split cotters, and stamping parts, components 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