Tianjin Brisk Metalwork Co.,Ltd is one of the manufacturers of ST 37 Mild Steel Hollow Section in China. Our products are mainly exported to the Middle East, Southeast Asia, Europe, New Zealand, and other regions.If you would like to learn more about our products, feel free to contact us and send your purchase list.

PRODUCTION

ERW Hollow Section

sSAW Hollow Section

SMLS Hollow Section

lSAW Hollow Section

Core Equivalent Steel Grade

Standard	Grade
DIN 17100	ST37-2
EN 10025-2	S235JR
GB/T 700	Q235B
ASTM A36/A36M	A36
JIS G3101	SS400

Comparison of chemical composition

Element	ST37-2(DIN)	S235JR(EN)	Q235B(GB)	A36(ASTM)	SS400(JIS)
C	≤0.20	≤0.20	0.12-0.20	≤0.25	≤0.25
Si	≤0.35	≤0.35	≤0.30	≤0.40	≤0.35
Mn	≤1.40	≤1.40	0.30-0.70	0.26-1.03	0.30-1.60
P	≤0.045	≤0.045	≤0.045	≤0.040	≤0.050
S	≤0.045	≤0.045	≤0.045	≤0.050	≤0.050
Al	≥0.02	≥0.02	-	-	-

The manganese content range of Q235B is narrower, while the upper limit of manganese content in A36 and SS400 is higher, which is more beneficial for strength improvement;
ST37-2 and S235JR explicitly require killed steel with aluminum deoxidation, whereas Q235B has no mandatory aluminum content requirement.

Mechanical Properties Comparison (Thickness ≤16mm)

Performance	ST37-2(DIN)	S235JR(EN)	Q235B(GB)	A36(ASTM)	SS400(JIS)
Yield Strength(Re)	≥235 MPa	≥235 MPa	≥235 MPa	≥250 MPa	≥245 MPa
Tensile Strength(Rm)	340-470 MPa	340-470 MPa	375-500 MPa	400-550 MPa	400-510 MPa
Longation(A)	≥25%	≥25%	≥26%	≥21%	≥21%
Impact(KV)	≥27 J(20°C)	≥27 J(20°C)	≥27 J(20°C)	-	-
Brinell hardness(HBW)	≤120	≤120	≤137	≤121	≤131

Yield strength: A36 and SS400 are slightly higher than ST37-2/S235JR/Q235B, with slightly stronger load-bearing capacity;
Elongation: Q235B, ST37-2, and S235JR have better plasticity, with superior cold bending and stamping forming performance;
Impact energy: ASTM A36 and JIS SS400 do not have mandatory requirements for impact energy at normal temperature, making them unsuitable for low-temperature or impact-resistant applications.

Key Features & Benefits

Common Use and Why it's Used

01.

common Uses:

Construction engineering field: used for steel structures such as factories, warehouses, and gymnasiums.

Mechanical Manufacturing Field: General mechanical components, fluid transport pipelines, and processing blanks for parts.

Municipal and residential sectors: water supply and drainage engineering, low-pressure residential gas branches (requiring anti-corrosion treatment), temporary water supply for construction sites.

02.

Why it's Used

Yield strength ≥235 MPa, tensile strength 340-470 MPa, fully suitable for general conditions at low pressure, normal temperature, and non-corrosive environments, without the need to choose more expensive high-strength steel pipes.

It can easily perform cold bending, flaring, reducing, and stamping, and can be processed into various shaped pipes (such as square and rectangular tubes, oval tubes), meeting diverse structural design requirements.

The corrosion resistance of ST37 steel pipes is average, but simple anti-corrosion treatments such as galvanizing, painting, or plastic spraying can meet the outdoor usage requirements for 5-10 years.