Ss 304 Seamless Round Tube
Physical property
Tensile strength σb (MPa)≥515-1035
Conditional yield strength σ0.2 (MPa)≥205
Elongation δ5 (%)≥40
Section shrinkage ratio ψ (%)≥?
Hardness: ≤201HBW; ≤92HRB; ≤210HV
Density (20℃, g/cm³) : 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℃, 10-6Ω·m2/m) : 0.73
Longitudinal modulus of elasticity (20℃, KN/mm2) : 193
Ss 304 Seamless Round Tube
For 304 stainless steel, the Ni element in its composition is very important, which directly determines the corrosion resistance of 304 stainless steel and its value.
The most important elements in 304 are Ni and Cr, but they are not limited to these two elements. Specific requirements are specified by product standards. The common judgment situation in the industry believes that as long as the Ni content is greater than 8% and the Cr content is greater than 18%, it can be considered 304 stainless steel. This is why the industry calls this type of stainless steel 18/8 stainless steel. In fact, the relevant product standards have very clear provisions for 304, and these product standards have some differences for different shapes of stainless steel. Below are some common product standards and tests.
In order to determine whether a material is 304 stainless steel, it must meet the requirements of each element in the product standard, as long as one does not meet, it cannot be called 304 stainless steel.
1,ASTM A276(Standard Specification for Stainless Steel Bars and Shapes)
|
304 |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
|
request,% |
≤0.08 |
≤2.00 |
≤0.045 |
≤0.030 |
≤1.00 |
18.0–20.0 |
8.0-11.0 |
2,ASTM A240(Chromium and Chromium-Nickel Stainless Steel Plate,Sheet, and Strip带 for Pressure essels and for General Applications)
|
304 |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
N |
|
request,% |
≤0.07 |
≤2.00 |
≤0.045 |
≤0.030 |
≤0.75 |
17.5–19.5 |
8.0–10.5 |
≤0.10 |
3,JIS G4305(cold-rolled stainless steel plate, sheet and strip)
|
SUS 304 |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
|
request,% |
≤0.08 |
≤2.00 |
≤0.045 |
≤0.030 |
≤1.00 |
18.0–20.0 |
8.0-10.5 |
4,JIS G4303 (Stainless steel bars)
|
SUS 304 |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
|
request,% |
≤0.08 |
≤2.00 |
≤0.045 |
≤0.030 |
≤1.00 |
18.0–20.0 |
8.0-10.5 |
The above four standards are only a few common standards, in fact, there are more than 304 standards mentioned in ASTM and JIS. Each standard actually has different requirements for 304, so in order to determine whether a material is 304, the accurate expression should say whether it meets the requirements of 304 in a product standard. Material certificates generally require the following types of reports:
|
No |
standard/S30400 |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
N |
Cu |
|
1 |
ASTM A276/A276M-15 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-11.0 |
- |
- |
|
2 |
ASTM A959-11 |
0.07 |
2.00 |
0.045 |
0.030 |
1.00 |
17.5-19.5 |
8.0-11.0 |
- |
- |
|
3 |
ASTM A240/A240M-15a |
0.07 |
2.00 |
0.045 |
0.030 |
0.75 |
17.5-19.5 |
8.0-10.5 |
- |
- |
|
4 |
ASTM A182/A182M-15 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-11.0 |
0.10 |
- |
|
5 |
ASTM A193/A193M-15 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-11.0 |
- |
- |
|
6 |
ASTM A269/A269M-15 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-11.0 |
- |
- |
|
7 |
ASTM A312/A312M-15a |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-11.0 |
- |
- |
|
8 |
ASTM A320/A320M-15a |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-11.0 |
- |
- |
|
9 |
ASTM A403/A403M-15 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-11.0 |
- |
- |
|
10 |
ASTM A493-09(2013) |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-10.5 |
0.10 |
1.00 |
|
11 |
ASTM A554-15a (MT-304) |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-11.0 |
- |
- |
|
12 |
JIS G4303:2012 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-10.5 |
- |
- |
|
13 |
JIS G4304:2012 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-10.5 |
- |
- |
|
14 |
JIS G4305:2012 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-10.5 |
- |
- |
|
15 |
GB/T 20878-2007 |
0.08 |
2.00 |
0.045 |
0.030 |
1.00 |
18.0-20.0 |
8.0-11.0 |
- |
- |
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