S235B - ISO 630-2-2021

Grade	S235B
Corresponding Standard	ISO 630-2-2021 Structural Steels - Part 2: Technical Delivery Conditions for Structrual Steels for General Purposes
Classification	Carbon Steel

S235B Chemical Element Composition Content (%)

	Component	C	Mn	P	S	Cu	N
t≤40	Minimum Value	-	-	-	-	-	-
t≤40	Maximum Value	0.17	1.4	0.035	0.035	0.55	0.012

	Component	C	Mn	P	S	Cu	N
t＞40	Minimum Value	-	-	-	-	-	-
t＞40	Maximum Value	0.2	1.4	0.035	0.035	0.55	0.012

• The table shows the chemical composition of heat analysis.

① FN = rimming steels not permitted; FF = fully killed steel. t=nominal thickness in mm
② For sections with nominal thickness > 100 mm, the C content is by agreement.
③ For long products, the P and S content may be 0,005 % higher.
④ For long products, the max. S content may be increased for improved machinability by 0,015 % by agreement if the steel is treated to modify the sulfide morphology, and if the chemical composition shows min. 0,002 0 % Ca.
⑤ The maximum value for nitrogen does not apply if the chemical composition shows a minimum total Al content of 0,020 % or, alternatively, minimum 0,015 % acid-soluble Al or if sufficient other N-binding elements are present. In this case, the N-binding elements shall be mentioned in the inspection document.
⑥ Cu content above 0,40 % can cause hot shortness during hot forming.
⑦ If other elements are added, they shall be mentioned on the inspection document.

S235B Mechanical Properties

thickness t mm	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
t≤16	360~510	ReH: ≥235	long.: ≥26 tr.: ≥24	≥27
16＜t≤40	360~510	ReH: ≥225	long.: ≥26 tr.: ≥24	≥27
40＜t≤63	360~510	ReH: ≥215	long.: ≥25 tr.: ≥23	≥27
63＜t≤80	360~510	ReH: ≥215	long.: ≥24 tr.: ≥22	≥27
80＜t≤100	360~510	ReH: ≥215	long.: ≥24 tr.: ≥22	≥27
100＜t≤150	350~500	ReH: ≥195	long.: ≥22 tr.: ≥22	≥27
150＜t≤200	340~490	ReH: ≥185	long.: ≥21 tr.: ≥21	≥27
200＜t≤250	340~490	ReH: ≥175	long.: ≥21 tr.: ≥21	≥27
250＜t≤400*	330~480	ReH: ≥165	long.: ≥21 tr.: ≥21	≥27

Approximate Comparison Table Carbon Structural Steel and Engineering Steel

China	International Organization for Standardization	European Standard
GB	ISO	EN	Numerical Grade
Q235B	S235B	S235JRC	1.0122

S235B Corresponding Standards(Same grade name, different standards)

1	ISO 630-2-2011
	S235B
2	ISO 683-18-2014
	S235B
3	ISO 630-2-2021
	S235B

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!