JIS G3101 SS400 Steel Equivalent Material Properties Specification Composition Density Strength

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JIS G3101 SS400 Steel

SS400 steel is the most commonly used hot-rolled structural steel (formerly known as SS41) in Japan, and is called general structural rolled steel in JIS G3101. SS400 material is cheap and versatile, and plays an important role in construction, bridges, civil engineering and mechanical equipment structures. Its appearance includes round steel, flat steel (flat steel), steel plates, steel strips and profiles.

Material SS400 Meaning

SS400 Steel meaning: SS is the abbreviation of Steel Structure, 400 means that the tensile strength is ≥ 400 MPa.

SS41 Meaning: 41 means that the tensile strength is 41kgf/mm2 or higher.

Datasheet and Specification

The following table shows the SS400 material specification and datasheet, including chemical composition, mechanical properties, physical properties and equivalent, etc.

Chemical Composition

The following table shows JIS SS400 steel chemical composition, please note that the carbon (C) content is not specified in JIS G3101, only the phosphorus (P) and sulfur (S) content.

Chemical Composition, %
Country (Region)StandardSteel GradeCMnP, ≤S, ≤
JapanJIS G3101SS4000.050.05

Note: If necessary, alloy elements not listed in this table can be added.

Physical Properties

The following table shows JIS SS400 material properties, including density and specific gravity, melting point, specific heat capacity, electrical resistivity, elastic modulus, thermal conductivity, linear expansion coefficient, Young’s modulus, magnetic permeability, etc.


  • 10-6·K-1 = 10-6/K
  • 1 Ω·mm²/m = 1 μΩ·m
  • 1 g/cm3 = 1 kg/dm3 = 1000 kg/m3
  • 1 GPa = 1 kN/mm2
  • 1 MPa = 1 N/mm2
Density and specific gravity, g/cm37.85
melting point, ℃1494-1527
Specific heat capacity, J/(Kg·K)473 at 20 ℃
Electrical resistivity, μΩ·mAbout 0,15 (20 ℃)
Long. elastic modulus, GPa206
Tr. modulus of elasticity, GPa79
Shear modulus, GPa79
Thermal conductivity, (W/m·K)57-60
Linear expansion coefficient, (10-6/K)11.3-11.6 (20 ℃)
Young’s modulus, GPa206
Poisson’s ratio0.3
Magnetic permeability, mm2/s13.9

Mechanical Properties

The following table shows SS400 material mechanical properties, such as yield point or yield strength (yield stress), tensile strength and elongation.

StandardSteelYield strength (≥, MPa); Steel thickness (t) in mm.Tensile Strength (MPa)Steel thickness (t) in mm.Test pieceElongation (≥, %)Bendability
t≤1616<t≤4040<t≤100>100Bending angleInter radiusTest piece
JIS G3101SS400245235215205400-510plates and sheets, steel strip in coils, flats and sections, t≤5No. 521180°1/2 thicknessNo. 1
plates and sheets, steel strip in coils, flats and sections, 5<t≤16NO. 1A17
plates and sheets, steel strip in coils, flats and sections, 16<t≤50NO. 1A21
plates and sheets, steel strip in coils, flats and sections, t>40No. 423
side or distance across flats of steel bars ≤25No. 220180°1.5 x diameter, side, or distance across flatsNo. 2
side or distance across flats of steel bars >25No. 14A22

Standard Thickness

Note: The thickness in brackets is not recommended.

SS400 Steel Plate Thickness in mm.

Thickness Tolerance

The following table summarizes JIS SS400 steel thickness tolerances. With the consent of the delivery party, you can limit the tolerance of this table to positive or negative. However, the total tolerance must be equal to the total tolerance range in the table.


  • If the thickness is 40 mm or more, the positive side tolerance can be relaxed through mutual negotiation.
  • The thickness of more than 350 mm should be agreed by both parties.
  • The width and thickness tolerance of 5000 mm depends on the agreement between the two parties.
Steel thickness tolerances in mm
Thickness (t)Plate Width (W)<16001600≤W<20002000≤W<2300
Material thickness tolerance in mm
Thickness (t)Steel Plate width (W)<16001600≤ W <20002000≤ W <25002500≤ W <31503150≤ W <40004000≤ W <5000

Standard Steel Plate Width

Standard width of steel plate and steel belt (mm)

Standard Length of Steel Plate

Standard length of steel plate (mm)

Material SS400 Equivalent Grades

The following table shows JIS SS400 steel equivalent materials, including the European EN standard (UK BSI, German DIN), American ASTM standard, international ISO standard, Chinese GB standard, Indian standard. (for reference only)

SS400 Equivalent Steel Grade
JapanUSEuropean UnionISOChinaCanadaIndia
StandardSteelStandardGradeStandardSteelStandardGradeStandardSteelStandardGrade (SI)StandardGrade
JIS G3101SS440ASTM A36A36 steelEN 10025-2S235 (S235JR)ISO 630S235GB/T 700Q235CSA G40.2144W (300W)IS 2062E250

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