SM400B is a low-alloy high-strength structural steel plate with excellent strength, toughness, and weldability. It is widely used for building structures, bridges, ships, and machinery components. The steel is suitable for both normal and low-temperature environments, meeting JIS G3106 and international structural steel standards.

Standard

JIS G3106

Grade: SM400B

Comparable foreign standards: EN 10025 S355 / ASTM A36

Chemical Composition (%)

Element	Content
C	≤ 0.17
Si	≤ 0.55
Mn	1.40 – 1.60
P	≤ 0.035
S	≤ 0.035
Ni	/
Cr	/
Mo	/

Note: Composition can be customized upon request, with Mill Test Certificate (MTC) provided.

Mechanical Properties

Item	SM400B
Yield Strength	≥ 400 MPa
Tensile Strength	490 – 610 MPa
Elongation	≥ 21%
Impact Toughness	-20°C ≥ 27 J

Available Specifications

Thickness: 6 mm – 80 mm

Width: 1,500 mm – 3,500 mm

Length: 6,000 mm – 12,000 mm or customized

Delivery Condition: Hot Rolled / Normalized

Surface: Black surface, sand blasted, oiled, anti-rust treated

Applications

Building structures and steel construction

Bridges and port facilities

Ships and mechanical components

Industrial plants and large equipment foundations

Product Advantages

High strength and excellent load-bearing capacity

Excellent toughness and weldability

Suitable for low-temperature applications

Stable chemical composition and mechanical properties

Compliant with international structural steel standards

Quality & Delivery

Mill Test Certificate EN10204 3.1 / 3.2 available

Third-party inspection supported (SGS / BV / TUV, etc.)

Custom cutting and ultrasonic testing (UT) available

Description

Gneesteel Grade :	JIS G3106 SM400B
Specification (mm)	THK: 6 to 300, Width: 1500 to 4050, Length: 3000 to 27000
Standard:	JIS G3106 Standard Specification is for Rolled Steels for Welded Structure.
Approval By Third Party	ABS, DNV, GL, CCS, LR , RINA, KR, TUV, CE
Classification:	Controlrolled weldable fine grain structural steels

Technicals

SM400BChemical Composition
Grade	The Element Max (%)
Grade	C	Si	Mn	P	S	Cu (min)
SM400B	0.20-0.22	0.35	0.6-1.50	0.035	0.035	-

Carbon Equivalent: Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%

Grade	SM400BMechanical Property
Grade	Thickness	Yield	Tensile	Elongation
SM400B	mm	Min Mpa	Mpa	Min %
	t≦16	245	400-510	18
	16<t≦90	215-235	400-510	24

Shipbuilding steel plate| Alloy steel plates| High strength plate| Carbon steel plate| Stainless steel plate

Equivalent steel grade of SM400B
Europe	Belgium	Germany	France	Italy	Sweden	India	USA	U.K
S235 J0	AE235B	St37-3U	E 24-3	Fe 360 C	SS 13,12,00	Fe 410-S	A284 gr, D	40C

Qualification

Strength

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