Racking System Material– The Complete FAQ Guide

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Q235 Grade Steel Material (Q235A&Q235B&Q235C&Q235D)

The racking system from OKE Storage is made of Q235-grade steel. As mild steel without heat treatment, Q235 steel is widely used in China. In the Chinese standard of GB/T 700, Q235 material is divided into four quality grades. They are Q235A, Q235B, Q235C, and Q235D. The steel density is 7.85 grams/cm3. The tensile strength: 370-500 MPa. The yield strength of this steel: 235 MPa. Steel plate thickness is within 16mm.

Benefits and Applications Area

Q235 steel has excellent plasticity, toughness, and weldability. And it has a certain strength and good cold bending performance. The Q235 steel material is usually used to roll wire type or round type steel, square type steel, flat type steel, angle type steel, i-steel, channel type steel, and more other profiles and plates. They are widely used in construction, industrial, and engineering welding structures, such as making steel bars or building factories, bridges and so on, as well as mechanical parts with less demanding performance.

material

Data Sheet and Specification

The following table lists the composition of different chemicals contained in different grades of Q235 and their different physical-mechanical properties.

Q235 Steel Properties

Chemical Components (heat analysis), %, ≤
Steel Grade	Quality Grade	C	Si	Mn	P	S	Deoxidation Method
Q235	Q235A	0.22	0.35	1.40	0.045	0.050	Rimmed/ Killed
	Q235B	0.20	0.35	1.40	0.045	0.045	Rimmed/ Killed
	Q235C	0.17	0.35	1.40	0.040	0.040	Killed
	Q235D	0.17	0.35	1.40	0.035	0.035	Exceptionally Killed

Q235 Grade Steel Properties

Physical Properties

Below is the data analysis of yield strength and tensile strength

The Chemical Components (heat analysis), %, ≤
Density.g/cm³	7.85
Melting point,℃	about 1493
Specific heat capacity, J/(Kg:K)	470 at 20 ℃
Electrical resistivity, μΩ. m	about 0,15(20℃)
Elastic modulus, GPa (kN/mm2)	200
Thermal conductivity, (W/m-k)	53-49(0-100℃)
Coefficient of thermal expansion, (10^-6/K)	11.3-11.6(20℃)
Young’s modulus, GPa(kN/mm2)	200
Poisson’s ratio	0.24-0.28

Mechanical Properties

ow is the data analysis of yield strength and tensile strength

		The Yield Strength (MPa, ≥); Thickness or Dia. (d) mm					Tensile Strength (MPa)
Steel Grade	Quality	d≤16	16＜d≤40	40＜d≤100	100＜d≤150	d≤100	d≤100
Q235	Q235A	235	235	215	195	185	370-500
	Q235B
	Q235C
	Q235D

The Results Of Bending Test: Q235 Raw Material

Cold Bending Test 180°(B=2a)
Grade	Sample Orientation	Steel Dia. (d) of Curve Center
		d≤60mm	60＜d≤100mm
Q235	Vertical	a	2a
	Horizontal	1.5a	2.5a

Q235 Steel Equivalent

Different regions have different names and divisions for steel materials.

Q235 material equivalent to ASTM, ISO, Japanese JIS standard, and European EN (French NF EN&British BS EN&German DIN EN…)

Q235 steel equivalent grades
China		US		European Union		Britain(UK)		Japan		ISO
Standard	Grade	Standard	Grade	Standard	Grade	Standard	Grade	Standard	Grade	Standard	Grade
GB/T 700	Q235A	ASTM A283/A283M; ASTM A36/A36M;	Grade D; A36 Steel;			BS 970 Part 1	080A15	JIS G 3101; JIS G 3106	SS400; SM400A
GB/T 700	Q235B	ASTM A283/A283M; ASTM A36;	Grade D; A36;	DIN EN 10025-2	S235JR(1.0038)	BS EN 10025-2	S235JR(1.0038)	JIS G3101; JIS G3106	SS400; SM400A
GB/T 700	Q235C	ASTM A283/A283M; ASTM A573/A573M; ASTM A36;	Grade D; Grade 58; A36;	DIN EN 10025-2	S235JO(1.0114)	BS EN 10025-2	S235JO(1.0114)	JIS G3106	SM400A, SM400B	ISO 630-2	S235B
GB/T 700	Q235D	ASTM A283M; ASTM A36;	Grade D; A36;	DIN EN 10025-2	S235J0(1.0114); S235J2(1.0117)	BS EN 10025-2	S235J0(1.0114); S235J2(1.0117)	JIS G3106	SM400A	ISO 630-2	S235B, S235C