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What is the difference between ss301 and ss304 stainless steel strip

What is the difference between ss301 and ss304 stainless steel strip

Time:2022-04-02 Source:Wuxi Jianuo Special Steel Co., Ltd.

301 and 304 stainless steel with the difference mainly depends on what you do, in terms of that quality will directly look at the cr and ni elements containing content

304 precision stainless steel belt material description.

Characteristics: As a widely used steel, has good corrosion resistance, heat resistance, low temperature strength and mechanical properties; stamping, bending and other hot workability, no heat treatment hardening phenomenon (non-magnetic, use temperature -196 ℃ ~ 800 ℃ ). In the general state, its corrosion resistance is similar to 304 steel, but after welding or stress relief, its resistance to grain boundary corrosion; in the absence of heat treatment, can also maintain good corrosion resistance, the use of temperature -196 ℃ ~ 800 ℃


304 is equivalent to our 0Cr19Ni9 (0Cr18Ni9) stainless steel

Chemical composition








Tensile Strength(Mpa) 620 MIN

Yield strength(Mpa) 310 MIN

Elongation(%) 30 MIN

Area reduction(%) 40 MIN

Density of 304 stainless steel 7.93 g/cm3

This value is generally used for austenitic stainless steels

Main applications

304 applications: household products (class 1 and 2 tableware, cabinets, indoor plumbing, water heaters, boilers, bathtubs), automotive parts (windshield wipers, mufflers, molded products), medical appliances, building materials, chemicals, food industry, agriculture, marine parts

304L use: Used in chemical, coal and oil industries with high requirements for resistance to grain boundary corrosion, heat-resistant parts for building materials and parts with heat treatment difficulties

304 surface is divided into 3 types.

(1), 2D surface is calendered surface, also called ordinary bright surface.

(2), 2B surface for the matte surface, soft material, general hardness of 160-200 between, this surface

(2), 2B surface is matte, soft material, generally between 160-200 hardness, this surface is made by annealing after pickling, can be deep drawn, deep punching; (DDQ, DQ)

(3), BA surface is bright mirror soft material, the general hardness is 190 or more, this surface is through

After bright annealing, lightly rolled by polishing rolls, can also be deep-drawn

301 (17Cr-7Ni-carbon) material: compared with 304 steel, Cr, Ni content is less, cold processing tensile strength and hardness increased, non-magnetic, but magnetic after cold processing.

301: surface is also divided into two kinds.

(1), 2D for the calendered surface, also called ordinary bright surface.

(2), 2B surface for soft material matte

Introduction 301 stainless steel strip is a sub-stable austenitic stainless steel, in full solid solution conditions, with a fully austenitic organization. In austenitic stainless steel, 301 is the easiest cold deformation strengthening steel, through cold deformation processing can make the steel strength, hardness, and retain sufficient plasticity, toughness, plus this steel has good rust resistance in atmospheric conditions, but in reducing media corrosion resistance is poor, in acid, alkali, salt and other chemical media corrosion resistance is poor, so it is not recommended for the corrosion of harsh environments. 301 is mainly used in the cold working state In the higher load, but also want to reduce the weight of equipment and rust-free equipment components. In addition, this steel is susceptible to work hardening when impacted by external forces can absorb more impact energy, which will provide more reliable safety for equipment and personnel.

301 stainless steel strip (grade 1Cr17Ni7)

Chemical composition

Chemical composition %

C: ≤ 0.15, Si: ≤ 1.0

Si: ≤1.0, Mn: ≤2.0

Mn :≤2.0, Mn :≤2.0, Mn :≤2.0

Cr :16.0~18.0

Ni: 6.0-8.0, S: ≤0.03

S: ≤ 0.03, P: ≤ 0.045

P: ≤ 0.045


301 stainless steel strip

● Mechanical properties.

Tensile strength σb (MPa): ≥520

Conditional yield strength σ0.2 (MPa): ≥205

Elongation δ5 (%):≥40

Fractional shrinkage ψ (%): ≥60

Hardness: ≤187HB;≤90HRB;≤200HV

Heat treatment specification and metallographic organization.

Heat treatment specification: solid solution 1010 ~ 1150 ℃ fast cooling.

Metallographic organization: Organizational characteristics of austenite type.

Density 7.93 g-cm-3

Specific heat c(20℃)0.502 J-(g-C)-1

Thermal conductivity λ/W(m-°C)-1 (at the following temperatures/°C)

20 100 500

12.1 16.3 21.4

Coefficient of linear expansion α/(10-6/°C) (between the following temperatures/°C)

20 to 100 20 to 200 20 to 300 20 to 400

16.0 16.8 17.5 18.1

Resistivity 0.73 Ω-mm2-m-1

Melting point 1398~1420℃

3 Main application

Uses: trains, aircraft, conveyor belts, vehicles, bolts, springs, screens.