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Common Material Difference Of Metal Dome

Views:38     Author:Site Editor     Publish Time: 2020-11-17      Origin:Site


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As a leading custom metal dome manufacturer in China, Dongchen has more than 10 years of experience in the production of metal shrapnel. Now I will explain to you the commonly used materials of metal shrapnel and their differences.


Before introducing the difference between the two stainless steel materials, let's first understand the chemical composition and mechanical properties of the next two materials.

Chemical composition of stainless steel SUS301 material:

Carbon C: ≤0.15

Silicon Si: ≤1.00

Manganese Mn: ≤2.00

Sulfur S: ≤0.030

Phosphorus P: ≤0.035

Chromium Cr: 16.00~18.00

Nickel Ni: 6.00~8.00


Mechanical properties of stainless steel SUS301:

Tensile strength σb (MPa): ≥520 conditional yield strength σ0.2 (MPa): ≥205

Elongation δ5 (%): ≥40

Reduction of area ψ (%): ≥60

Hardness: ≤187HB; ≤90HRB; ≤430HV


Chemical composition of stainless steel SUS304:

Carbon C: ≤0.08

Silicon Si: ≤1.00

Chromium Cr: 17.00-19.00

Manganese Mn: ≤2.00

Nickel Ni: 8.00-11.00

Phosphorus P: ≤0.035

Sulfur S: ≤0.030


Mechanical properties of stainless steel SUS304:

Yield strength σ0.2=205 MPa

Tensile strength σb=520 Mpa

Elongation δ5=40%

Hardness HB ≤187 HRB≤90 HV ≤200

Young's modulus E=194020 MPa

Hardening index n=0.193

Thickness anisotropy index r00=0.936

r45=1.123

r90=0.909

Density ρ=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

2.1 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℃


From the above parameters, we can see that the Cr element content of the two materials is different, and the performance is also different. From the above data analysis, we can clearly see that the hardness of the 301 material is higher than 304, which will lead to feel, life, Factors such as heat resistance and corrosion resistance are different. Most of the domestic metal shrapnel use 301 as the material, Hong Kong and many foreign countries use 304 as the metal shrapnel material.


Two kinds of stainless steel materials belong to Martens stainless steel, let's introduce the heat resistance and corrosion resistance in detail below. The content of Cr and Ni in 304 material is relatively high, so the heat resistance and corrosion resistance are higher than that of 301 stainless steel. Very high traction and hardness can be obtained during processing, so the elasticity is also due to the 301 material, but the processing and material costs are higher than the 301 material.


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