309（309S）high quality stainless steel pipe

309 stainless steel is a high-alloy austenitic stainless steel that contains a higher percentage of chromium and nickel compared to standard stainless steel grades. The 309s variant is a low-carbon version of 309, which enhances its resistance to sensitization during welding. This unique composition allows the 309 (309s) stainless steel pipe to withstand extreme temperatures and corrosive environments, making it a preferred material in industries that require reliability and longevity.

product details

specification

Product Name	309（309S）stainless steel pipe
Standard	ASTM,JIS,DIN,GB,AISI,DIN,EN
Outer diameter	Round Pipe	4mm-200mm
	Square Pipe	1010mm-100100mm
	Rectangular Pipe	1020mm-50100mm
Wall Thickness	0.6mm-6.0mm
Length range	1-6 meters, Length can be customized
Error	±1%
Certification	ISO 9001 ，CE，API
Surface treatment	Black, Bright Polished, Rough Turning, Matt Surface Treatment, No. 4. BA, etc.
Country of origin	China
Main Applications	1.High temperature equipment: Due to its excellent high temperature resistance, 309 stainless steel is often used in the manufacture of high temperature furnaces, incinerators, heat exchangers and other equipment.
	2.Chemical industry: In chemical production, 309 stainless steel pipes can be used to transport corrosive media, especially in high temperature environments.
	3.Oil and gas industry: used in high temperature and high pressure pipeline systems such as oil refining and natural gas processing.
	4.Electric power industry: Widely used in high-temperature components such as boilers and steam pipes in power plants.
	5.Food processing: In some high-temperature food processing equipment, 309 stainless steel can also be used to make pipes and containers.
	6.Aerospace: Due to its excellent heat resistance, 309 stainless steel is also used in the aerospace field.
	7.Welded structure: 309S stainless steel is often used for welding structural parts due to its good welding performance.
Package	Simple packaging, reinforced packaging, wooden frame, metal frame, pallet, wrapping
Payment Term	TT, LC,Cash, Paypal, DP, DA,Western Union or Others.
After-sales service	1. Quality assurance period 2. Return and exchange policy 3. Delivery and acceptance assistance 4. Customer feedback collection

Product Display

Chemical Composition

C	Si	Mn	Cr	Ni	S	P
≤ 0.08	≤0.75	≤ 2.0	22.0～24.0	12.0～15.0	≤ 0.03	≤ 0.045

Mechanical Properties

Tensile Strength Kb (MPa)	Yield Strength σ0.2 (MPa)	Elongation D5 (%)	Hardness
≥515	≥ 205	≥ 35	≤ 217HB

Physical Performance

Density(g/cm³)	Modulus of Elasticity(Gpa)	Coefficient of Thermal Expansion(10-6/°C)	Coefficient of Thermal Conductivity(W/m*K)	Resistivity(ΜΩ. cm)
7.98	200	14.9	15.6	78

Production process

Raw material preparation:
Select appropriate alloying elements, such as chromium, nickel, manganese, silicon, etc., to ensure that they meet the chemical composition standards of 309 or 309S stainless steel.
Smelting:
The raw materials are melted in an electric arc furnace or induction furnace to form molten stainless steel. The temperature and composition need to be controlled during the melting process to ensure the uniformity of the alloy.
Casting:
Casting molten stainless steel into ingots or blocks, usually by continuous casting or mold casting.
Hot rolled or cold rolled:
The ingot or block is gradually processed into the desired tube shape by hot or cold rolling. Hot rolling is usually carried out at high temperature to increase plasticity and reduce deformation resistance.
Tube preparation:
Cut the rolled material to prepare tube blanks, which can be seamless tubes or welded tubes.
Tube forming:
For seamless pipes, the tube blank is processed into pipe by piercing; for welded pipes, flat plates or coils are formed and then welded.
Heat treatment:
Heat treatment of the pipe to eliminate internal stress and improve the mechanical properties and corrosion resistance of the material. Common heat treatment methods include annealing.
Cooling and cleaning:
After heat treatment, the tubes need to be cooled and cleaned to remove surface oxides and impurities.
Inspection and testing:
Conduct various inspections and tests on finished pipes, including chemical composition analysis, mechanical property testing, non-destructive testing (such as ultrasonic testing, X-ray testing), etc. to ensure that product quality meets standards.
Surface treatment:
According to customer needs, surface treatment such as pickling and polishing is carried out to improve the corrosion resistance and aesthetics of the pipe.
Packaging and Shipping:
Finally, the qualified 309 (309S) stainless steel pipes are packaged and ready to be shipped to customers.