Q235

Q235 Special Alloy

Chemical composition%of the ladle analysis of gradeQ235

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

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

Mechanical properties of gradeQ235

Proof strength Rp0.2(MPa)	Tensile strength Rm(MPa)	Impact energy KV(J)	Elongation at fracture A(%)	Reduction in cross section on fracture Z(%)	As-Heat-Treated Condition	Brinell hardness(HBW)
875(≥)	274(≥)	33	24	33	Solution and Aging,Annealing,Ausaging,Q+T,etc	243

Physical properties of grade Q235

Property	Density kg/dm3	Temperature T °C/F	Specific heat J/kgK	Thermal conductivity W/mK	Electric resistance µΩ·cm	Modulus of elasticity kN/mm2	Expansion rate
479(≥)	328(≥)	14	33	42	Solution and Aging,Annealing,Ausaging,Q+T,etc	443
Temp. °C/°F	Creep strain limit (10000h) (Rp1,0)N/mm2	Creep rupture strength (10000h) (Rp1,0)N/mm2
441	654	793

Q235 Range of products

Product type	Products	Dimension	Processes	Deliver Status
Plates/Sheets	Plates/Sheets	0.08-200mm(T)*W*L	Forging,hot rolling and cold rolling	Annealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Steel Bar	Round Bar,Flat Bar,Square Bar	Φ8-1200mm*L	Forging,hot rolling and cold rolling,Cast	Black,Rough Turning,Shot Blasting,
Coil/Strip	Steel Coil/Steel Strip	0.03-16.0x1200mm	Cold-Rolled&Hot-Rolled	Annealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Pipes/Tubes	Seamless Pipes/Tubes,Welded Pipes/Tubes	OD:6-219mm x WT:0.5-20.0mm	Hot extrusion,Cold Drawn,Welded	Annealed,Solution and Aging,Q+T,ACID-WASHED