〣Introduction

304L stainless steel, also known as ultra-low carbon stainless steel, is a kind of universal stainless steel material, widely used in the production of good comprehensive performance (corrosion resistance and formability) of equipment and parts.

304L Stainless Steel Brand:

The old standard JB/T 4237-1992 corresponds to 00Cr19Ni10

New standard GB/T 20878-2007 stainless steel and heat-resistant steel grade and chemical composition

And GB 24511 2009 stainless steel plates and strips for pressure equipment

The above corresponds to 022Cr19Ni10, and its carbon content is about 0.03%

The unified digital code S30403 is different from the S30408 of 304

〣Chemical composition

Chemical composition analysis of 304L stainless steel %

Carbon C: ≤0.03,

Si: ≤1.0,

Manganese Mn: ≤2.0,

Chromium Cr: 18.0 ~ 20.0,

Ni: 9.0 ~ 12.0,

Sulfur S: ≤0.03,

P: ≤0.045;

Mechanical property

Mechanical properties of 304L stainless steel:

Yield strength (N/mm2) ≥205

Tensile strength ≥520

Elongation (%) ≥40

Stainless steel rod

Stainless steel rod

Hardness HB ≤187 HRB≤90 HV ≤200 Density 7.93 g·cm-3

Specific heat c(20℃)0.502 J·(g·C)-1

Thermal conductivity λ/W(m·℃)-1 (at the following temperature /℃)

20 100 500

12.1 16.3 21.4

Linear expansion coefficient α/(10-6/℃) (between the following temperatures /℃)

20 ~ 100 20 ~ 200 20 ~ 300 20 ~ 400

16.0 16.8 17.5 18.1

Resistivity 0.73 Ω·mm2·m-1

Melting point 1398 ~ 1420℃

304L is a variant of the lower carbon 304 stainless steel for use in welding situations. The lower carbon content minimizes the carbide precipitation in the heat-affected zone near the weld, which may lead to intergranular corrosion (welding erosion) of stainless steel in some environments.

〣Product parameter