1.4301

The everyday austenitic stainless (304): fy 210 MPa plate, 230 MPa cold rolled strip.

Corrosion resistance class II: inland atmospheres without chlorides. Often certified together with 1.4307 (304L) so welded parts need no other grade.

Nominal thicknessmm

0.2 % proof strength Rp0.2: ≥ 210MPa
Corroborated≤ 75 mm · hot rolled plate; ≥ 190MPa
Single source≤ 250 mm · bars, rods and sections
Tensile strength Rm: ≥ 520MPa
Corroborated≤ 75 mm · hot rolled plate; ≥ 500MPa
Single source≤ 250 mm · bars, rods and sections
Elongation after fracture A: ≥ 45%
Single source≤ 75 mm · hot rolled plate

Mechanical

Elastic

Modulus of elasticity E

Young's modulus for design.

Condition	Value	Evidence
	200 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
	≥ 230MPa	Single source
	≥ 210MPa	Single source
	≥ 210MPa	Corroborated
	≥ 190MPa	Single source

Tensile strength Rm

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

Condition	Value	Evidence
	≥ 540MPa	Single source
	≥ 520MPa	Single source
	≥ 520MPa	Corroborated
	≥ 500MPa	Single source

Ductility

Elongation after fracture A

Minimum elongation; depends on gauge length and test direction.

Condition	Value	Evidence
	≥ 45%	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 900kg/m³	Single source

Thermal

Coefficient of thermal expansion α

Linear, near room temperature.

Condition	Value	Evidence
	16×10⁻⁶ /K	Single source

Specific heat capacity cp

Heat needed to warm 1 kg by 1 K.

Condition	Value	Evidence
	500J/(kg·K)	Single source

Thermal conductivity λ

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

Condition	Value	Evidence
	15W/(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
	II	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
	0.78	Single source
	0.65	Single source
	0.6	Single source
	0.55	Single source
	0.5	Single source
	0.46	Single source
	0.38	Single source
	0.25	Single source
	0.15	Single source
	0.07	Single source
	0.05	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
	0.96	Single source
	0.92	Single source
	0.88	Single source
	0.84	Single source
	0.8	Single source
	0.76	Single source
	0.71	Single source
	0.63	Single source
	0.45	Single source
	0.2	Single source
	0.1	Single source

Ultimate strength reduction factor ku,θ

Tensile strength at temperature θ relative to 20 °C.

Condition	Value	Evidence
	1	Single source
	0.81	Single source
	0.72	Single source
	0.68	Single source
	0.66	Single source
	0.61	Single source
	0.54	Single source
	0.4	Single source
	0.25	Single source
	0.13	Single source
	0.08	Single source
	0.05	Single source

Chemical composition

Show on the periodic table

1.4301, cast analysis to EN 10088 (SCI P413 Table 2.1)

Element	Applies to	Range %	Evidence
C	all thicknesses	0.070	Single source
Cr	all thicknesses	17.5–19.5	Single source
Ni	all thicknesses	8–10.5	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.