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1.4307

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Description

Type 1.4307 (304L) is the low carbon version of 1.4301 (304). It is used in heavy gauge components for improved weldability. Some products such as plate and pipe may be available as “dual certified” material that meets the criteria for both 1.4301 (304) and 1.4307 (304L).

Related Standards

Equivalent Materials

Properties

Electrical

Electrical resistivity ρel

7.2E-8 Ω·m at 20 °C

General

Density ρ

8 g/cm³ at 20 °C

Mechanical

Elastic modulus E

193 GPa at 20 °C

Hardness, Brinell HB

215 [-] at 20 °C

Tensile strength Rm

500 - 700 MPa at 20 °C

Yield strength YS

175 MPa at 20 °C

Thermal

Coefficient of thermal expansion α

1.72E-5 1/K at 20 °C

Melting point Tm

1450 °C

Thermal conductivity λ

16.2 W/(m·K) at 20 °C

Chemical properties

Element

Weight %

Comment

Fe

-

Balance

Cr

17.5 - 19.5 %

Ni

8 - 10.5 %

Mn

2 %

Si

1 %

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Technological properties

Corrosion properties

The close grade 304 has good resistance to oxidation in intermittent service up to 870°C and in continuous service to 925°C. However, continuous use at 425-860°C is not recommended if corrosion resistance in water is required. In this instance 1.4307 (304L) is recommended due to its resistance to carbide precipitation.

General machinability

1.4307 has good machinability. Machining can be enhanced by using the following rules: Cutting edges must be kept sharp. Dull edges cause excess work hardening. Cuts should be light but deep enough to prevent work hardening by riding on the surface of the material. Chip breakers should be employed to assist in ensuring swarf remains clear of the work. Low thermal conductivity of austenitic alloys results in heat concentrating at the cutting edges. This means coolants and lubricants are necessary and must be used in large quantities.

Welding

For 304L the recommended filler is 308L. Heavy welded sections may require post-weld annealing. This step is not required for 304L. Grade 321 may be used if post-weld heat treatment is not possible.

Workability

Fabrication methods involving cold working may require an intermediate annealing stage to alleviate work hardening and avoid tearing or cracking. At the completion of fabrication a full annealing operation should be employed to reduce internal stresses and optimise corrosion resistance. Fabrication methods, like forging, that involve hot working should occur after uniform heating to 1149-1260°C. The fabricated components should then be rapidly cooled to ensure maximum corrosion resistance.

This material data has been provided by Righton Blackburns.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.