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What is the difference between 301 material and 304 material




301 stainless steel belt is a kind of metastable austenitic stainless steel, which has complete austenitic structure under the condition of full solid solution. In stainless steel, 301 is the most easily cold deformation strengthening steel grade, through the cold deformation processing can make the

strength of steel, hardness, and retain enough plastic and toughness, together with the steel under the condition of the atmosphere with good rust resistance, but the poor corrosion resistance, reducing medium in acid and alkali salt chemical medium corrosion resistance is poorer, therefore is not

recommended for corrosion harsh environment. 301 is mainly used in cold working condition to bear high load, and hope to reduce the weight of equipment and non-rust equipment parts. In addition, this steel is prone to work hardening when hit by external forces, which can absorb more impact

energy and provide more reliable security for equipment and personnel.
 
301 is prone to work hardening during deformation and is used in places requiring higher strength
 
performance
 
301 stainless steel yield strength (N/mm2) ≥205
 
Tensile strength ≥520 elongation (%) ≥40
 
Hardness HB ≤187 HRB≤90 HV ≤200
 
The density of 7.93 g · cm - 3
 
Specific heat c (20 ℃) 0.502 j. (g · c) - 1
 
Thermal conductivity lambda /W(m·℃)-1 (at the following temperatures /℃)20 100 500 12.1 16.3 21.4
 
Linear expansion factor alpha /(10-6/℃) (between the following temperatures /℃) 20 ~ 100 20 ~ 200 20 ~ 300 20 ~ 400 16.0 16.8 17.5 18.1
 
Resistivity Ω, was, 0.73 m - 1
 
Melting point 1398 ~ 1420℃
 
Mechanical properties of
 
Sigma b (MPa) : ≥520
 
Yield strength sigma 0.2 (MPa) : ≥205
 
Elongation 5 (%) : ≥40
 
Reduction of area bits (%) : 60 or higher
 
Hardness: 187 hb or less; 90 HRB or less; 200 hv or less
 
Heat treatment specification and metallographic structure
 
Heat treatment specification: solid solution 1010 ~ 1150℃ fast cooling.
 
304 stainless steel is a common material in stainless steel, the density of 7.93 g/cm cubed, the industry is also called 18/8 stainless steel. High temperature resistance 800℃, with good processing performance, high toughness characteristics, widely used in industry and furniture decoration

industry and food and medical industry.
 
There are 06Cr19Ni10 and SUS304 in the market, among which 06Cr19Ni10 generally means national standard production, 304 means ASTM standard production, and SUS304 means Japanese standard production.
 
304 is a kind of universal stainless steel, it is widely used in the production of equipment and parts requiring good comprehensive performance (corrosion resistance and molding). To maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 18% chromium and

more than 8% nickel. 304 stainless steel is a brand of stainless steel produced according to American ASTM standard.
 
Physical properties of
 
Sigma b (MPa)≥515-1035
 
Yield strength sigma 0.2 (MPa)≥205
 
Elongation of 5 (%)≥40
 
Reduction of area bits of p (%)?
 
Hardness: 201 HBW or less; 92 HRB or less; 210 hv or less
 
Density (20℃, g/cm ^ 3) : 7.93
 
Melting point (℃) : 1398~1454
 
Specific heat capacity (0~100℃, KJ· kg-1k-1) : 0.50
 
Thermal conductivity (W·m-1· k-1) :(100℃) 16.3, (500℃) 21.5
 
Linear expansion coefficient (10-6· k-1) :(0~100℃) 17.2, (0~500℃) 18.4
 
Resistivity (20 ℃, 10-6 Ω m2 / m) : 0.73
 
Longitudinal modulus of elasticity (20℃, KN/mm2) : 193

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