8 6 3 Inch Ss 304 Round Tube
8 6 3 Inch Ss 304 Round Tube
8 6 3 Inch Ss 304 Round Tube
8 6 3 Inch Ss 304 Round Tube

8 6 3 Inch Ss 304 Round Tube

stainless steel 304 Round pipe
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

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Product Introduction

8 6 3 Inch Ss 304 Round Tube

Blackening after processing:
In general, products made of good 304 stainless steel tubes do not appear in this situation. If the stainless steel pipe product becomes black during long-term use, it is because the stainless steel pipe is a layer of oxide film produced under the action of air. The main function of this layer of oxide film is to protect the metal in stainless steel from oxidation. This layer of oxide film does not need to be deliberately wiped off, and will not damage the pipe. Stainless steel pipes of different materials have certain differences in element content. So the color of the oxide film will be different, but it has no effect on the pipeline.
In this case, no other treatment is required. If you feel that it is not beautiful to use, you can go to the stainless steel pipe processing center for polishing treatment, which can be easily solved.

Welding appears black:

If the stainless steel pipe is welded, the inner and outer surfaces of the stainless steel pipe will be black and yellow. This is because the welding gas is not pure enough or the back is oxidized due to high temperature. There are three ways to prevent this from happening.

1, improve the purity of argon used in stainless steel pipe welding to pure argon. From the outer surface of the stainless steel pipe, pure argon is obviously brighter than ordinary argon welding.

2. The argon gas on the back should be protected. Important stainless steel pipes should be protected on the back after welding. Otherwise, high temperature oxidation will cause the oxidation of the solder layer to penetrate the back and cause defects. It can effectively prevent the oxidation of the back after completion.

3, can be coated on the back of a protective film, can save argon protection, coating thickness of about 1mm. Then, when the front is welded, the back will form a thin film to form a protective layer.

The solution:

If the solder stain of the stainless steel pipe is found to be black, it can be cleaned with pickling passivation paste, which is to use acid to corrode the black oxide layer on the surface, and then rinse it off with water.

Therefore, in order to avoid this blackening and cleaning situation of 304 stainless steel pipe, it is recommended to choose JBLsteel stainless steel pipe manufacturers with guaranteed quality, which will bring unnecessary trouble to our lives.

/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	0.008	2.00	0.045	0.030	1.00	18.0-20.0	8.0-11.0
15	GB/T 20878-2007	0.08	2.00	0.045	0.030	1.00	18.0-20.0	8.0-11.0