EN 10088-2/-3/-4/-5· Europe

1.4003

12 % chromium ferritic utility stainless: cheap, magnetic, corrosion resistance class I.

Nominal thicknessmm

0.2 % proof strength Rp0.2: ≥ 250MPa
Single source≤ 25 mm · hot rolled plate; ≥ 260MPa
Single source≤ 100 mm · bars, rods and sections
Tensile strength Rm: ≥ 450MPa
Single source≤ 25 mm · hot rolled plate; ≥ 450MPa
Single source≤ 100 mm · bars, rods and sections

Mechanical

Elastic

Modulus of elasticity E

Young's modulus for design.

Condition	Value	Evidence
	220 000MPa	Single source

Shear modulus G

G = E / 2(1 + ν).

Condition	Value	Evidence
	76 900MPa	Single source

Poisson's ratio ν

In the elastic range.

Condition	Value	Evidence
	0.3	Single source

Strength

0.2 % proof strength Rp0.2

Minimum 0.2 % proof strength (used as fy in EN 1993-1-4).

Condition	Value	Evidence
	≥ 280MPa	Single source1
	≥ 280MPa	Single source
	≥ 250MPa	Single source
	≥ 260MPa	Single source

Tensile strength Rm

Ultimate tensile strength. Product standards give a range or a minimum.

Condition	Value	Evidence
	≥ 450MPa	Single source
	≥ 450MPa	Single source
	≥ 450MPa	Single source
	≥ 450MPa	Single source

Design values

Partial factor for the material γM

Recommended value; each country may set its own in the National Annex (a Nationally Determined Parameter).

Condition	Value	Evidence
	1.1	Single source
	1.1	Single source
	1.25	Single source

Physical

Density ρ

Mass per unit volume.

Condition	Value	Evidence
	7 700kg/m³	Single source

Thermal

Coefficient of thermal expansion α

Linear, near room temperature.

Condition	Value	Evidence
	10.4×10⁻⁶ /K	Single source

Specific heat capacity cp

Heat needed to warm 1 kg by 1 K.

Condition	Value	Evidence
	430J/(kg·K)	Single source

Thermal conductivity λ

Heat flow through 1 m of material per kelvin of temperature difference.

Condition	Value	Evidence
	25W/(m·K)	Single source

Chemical and durability

Corrosion resistance class CRC

EN 1993-1-4 Annex A: I (mild, inland) to V (severe chlorides). The site's corrosion resistance factor sets the class needed.

Condition	Value	Evidence
	I	Single source

Fire

0.2 % proof strength reduction factor in fire kp0.2,θ

fp0.2,θ / fy. Used for columns, unrestrained beams and Class 4 sections.

Condition	Value	Evidence
	1	Single source
	0.93	Single source
	0.91	Single source
	0.89	Single source
	0.87	Single source
	0.75	Single source
	0.43	Single source
	0.16	Single source
	0.1	Single source
	0.06	Single source
	0.04	Single source

Elastic modulus reduction factor kE,θ

Slope of the linear elastic range at θ relative to 20 °C.

Condition	Value	Evidence
	1	Single source
	0.98	Single source
	0.95	Single source
	0.92	Single source
	0.86	Single source
	0.81	Single source
	0.75	Single source
	0.54	Single source
	0.33	Single source
	0.21	Single source
	0.09	Single source

Ultimate strength reduction factor ku,θ

Tensile strength at temperature θ relative to 20 °C.

Condition	Value	Evidence
	1	Single source
	0.93	Single source
	0.89	Single source
	0.87	Single source
	0.84	Single source
	0.82	Single source
	0.33	Single source
	0.13	Single source
	0.09	Single source
	0.07	Single source
	0.05	Single source

Chemical composition

Show on the periodic table

1.4003, cast analysis to EN 10088 (SCI P413 Table 2.1)

Element	Applies to	Range %	Evidence
C	all thicknesses	0.030	Single source
Cr	all thicknesses	10.5–12.5	Single source
Ni	all thicknesses	0.3–1	Single source

Compare side by side

With any other grade

Sources here are public pages that reproduce EN 10088-2/-3/-4/-5. For design and acceptance, the standard edition named in your specification and the inspection certificate (EN 10204 3.1) of the delivered product take precedence. Design factors are recommended values; your National Annex may set others.