304 stainless steel is a common stainless steel material, the density of 7.93 g/cm3, the industry is also called 18/8 stainless steel. High temperature resistance of 800 degrees, with good processing performance, high toughness characteristics, widely used in industrial and furniture decoration industry and food industry.
The common methods of marking the market are 06Cr19Ni10, SUS304, which generally means that the national standard 06Cr19Ni10 production, 304 generally means that the production of ASTM standard, SUS, said the standard production of the standard 304.
304 is a general purpose stainless steel, it is widely used in the production of good performance requirements (corrosion resistance and formability) of equipment and parts. In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 18% chromium, nickel content of more than 8%. 304 stainless steel is produced in accordance with the United States ASTM standard stainless steel brand.
Physical property:
The ultimate tensile strength of B (MPa) = 520
304 stainless steel Atlas (6)
Conditional yield strength (MPa = 205) 0.2
5 elongation (%) = 40
Section shrinkage (%) = 60 PSI
Hardness: = 187HBW; 90HRB = 200HV;
Density (20 DEG C, g/cm3): 7.93
Melting point (c): 1398~1454
Specific heat capacity (0~100 C, KJ = kg-1K-1): 0.50
Thermal conductivity (W. M-1. K-1): (100 DEG C), 16.3, (C = C), 21.5
Coefficient of linear expansion (10-6 = K-1): (0~100 DEG C) 17.2, (0~500 DEG C), 18.4
Resistivity (20, 10-6) (m)
Longitudinal modulus of elasticity (20 DEG C, KN/mm2): 193
304 of the most important elements are Ni, Cr, but not limited to these two elements. Specific requirements by product standards. Industry common judgment that as long as the content of Ni is greater than 8%, Cr content of more than 18%, it can be considered to be the 304 stainless steel. This is why the industry will be called stainless steel 18/8 stainless steel reasons. In fact, the relevant product standards for 304 have very clear requirements, and these products for different shapes of stainless steel standards and some differences. Here are some common product standards and testing.
To determine whether a material is 304 stainless steel, must meet the requirements of each element of the product standard, as long as there is a non conformity, it can not be called the 304 stainless steel.
International stainless steel marking method
The American Iron and Steel Institute uses three digits to mark various standard grades of wrought stainless steel. Which:
Austenitic stainless steel with 200 and 300 series of numbers, for example, some of the more common austenitic stainless steel with a mark of 201, 304, 316 and 310,
400 series digital representation of ferritic and martensitic stainless steels.
Ferritic stainless steel is marked by 430 and 446, and the martensitic stainless steel is marked by 410, 420 and 440C,
Double phase (austenite ferrite), stainless steel, precipitation hardening stainless steel and high alloy steel containing less than 50% are usually named after patent or trademark.
4) classification and classification of standards
4-1 classification: national standard GB industry standard YB local standard enterprise standard Q/CB
4-2 classification: product standard packaging standard method standard
4-3 standard level (level three): Y: international advanced level I: international general level H: domestic advanced level
4-4 GB
GB1220-2007 stainless steel bar (I class) GB4241-84 stainless steel welding plate garden (H level)
GB4356-2002 stainless steel welded plate garden (I class) GB1270-80 stainless steel pipe (I class)
GB12771-2000 stainless steel welded pipe (Y class) GB3280-2007 stainless steel cold plate (class I)
GB4237-2007 stainless steel hot plate (I class) GB4239-91 stainless steel cold band (I class)