One can buy from Zhejiang Xintongda Special Steel (XTD) in Songyang, China, a leading manufacturer of stock and custom 309 seamless pipes with quick global delivery.
ASTM A312 Stainless Steel 309 Seamless Pipe Manufacturer
We, Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. (XTD), are a reliable manufacturer and global supplier of stainless steel 309 seamless pipes. Commonly referred to as 309 SS pipe, this pipe is an austenitic chromium-nickel alloy consisting of iron, manganese, silicon, phosphorus, sulfur, chromium (approximately 22-24%), nickel (approximately 12-15%), and carbon (max 0.2%). We manufacture 309 SS pipes with an advanced manufacturing method in accordance with ASTM A312, EN, JIS, and GB standards. Our pipes provide strong oxidation and scaling resistance, stable mechanical strength at high temperatures and reliable performance in both oxidising and sulfur-containing environments. We offer 309 seamless pipes for high-temperature and corrosive applications in industries such as boilers, industrial furnaces, petrochemical processing, and flue gas desulfurisation systems. With large-scale production facilities in Songyang, China, and an annual capacity of 25,000 tons, along with strong international shipping capabilities, we ensure a steady supply and timely delivery around the world. All of our 309 seamless pipes have been carefully tested under multiple international certifications to ensure consistent quality and reliability.
Product specifications cover:
Standard ASTM A312
OD Range 6 to 1016 mm 
Thickness 1 to 65 mm
Length ≤ 18 m
Get a free quote now
Technical Data
Technical Data
SS 309 Seamless Pipe Manufacturing Process
We begin the manufacturing process of stainless steel 309 seamless pipe by heating a solid stainless steel billet to the specified temperature. The heated billet is pierced or extruded to produce a hollow shell with no weld seams. This shell is then hot-worked and cold-drawn or cold-rolled to obtain the desired dimensional accuracy. The pipe then undergoes solution annealing, which is followed by pickling, straightening, and final inspection to ensure quality and performance. Visit our page to learn more about the production process.
Key Features of 309 Stainless Steel Pipe
Our 309 stainless steel pipe offers 4 key features, such as high chromium and nickel content, high temperature strength, oxidation/scaling resistance, and corrosion resistance.
- High Chromium and Nickel Content: This pipe contains a high amount of chromium and nickel, which makes it more resistant to heat and corrosion. These elements together produce a stable oxide layer. This makes the pipe reliable in severe, high-temperature environments.
- High-Temperature Strength: Our 309 stainless pipe maintains strength at elevated temperatures. It can maintain adequate mechanical strength for non-cyclic service at elevated temperatures, with excellent oxidation resistance up to 1900°F (1038°C). This characteristic makes the pipe suitable for non-cyclic service in furnaces and boiler applications.
- Oxidation/Scaling Resistance: Oxidation and scaling resistance define the performance of our 309 stainless steel pipe. It resists breakdown in air up to 1038°C. It provides better resistance in some sulfur-bearing atmospheres at high temperatures, depending on the sulfur activity and operating conditions.
- Corrosion Resistance: Corrosion resistance protects our 309 stainless pipe in moist or chemical environments. Chromium content provides good resistance to general corrosion and oxidation in high-temperature environments. Expect long service life in industrial use.
ASTM A312 TP309 Seamless Stainless Steel Pipe Equivalent Material
Our ASTM A312 309 seamless stainless steel pipe meets the global standards for easy sourcing and specs. Common equivalents include UNS S30900, EN 1.4828, and others listed below.
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| SS 309 | 1.4828 | S30900 | SUS 309 | 309S24 | 20KH20N14S2 | Z17CNS20-12 | X15CrNiSi20-12 |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
ASTM A312 SS 309 Seamless Pipe Applications
The applications of ASTM A312 309 seamless pipe include 6 key industries where heat and corrosion demand top performance. The uses of SS 309 smls pipes are given below.
Boiler components
We use 309 seamless stainless steel pipe in boiler tubes and superheaters. It withstands high pressure and steam at elevated temperatures. This ensures safe, efficient operation.
Flue Gas Desulfurization (FGD) Systems
FGD systems rely on our 309 SS pipe for scrubber pipes; it provides outstanding resistance to high-temperature sulfur-bearing flue gases and prevents degradation. It maintains material stability under flue gas exposure.
Industrial Furnaces
Industrial furnaces use our 309 seamless pipe for muffles and retorts. Oxidation resistance up to 1900°F maintains integrity. Heat transfer stays optimal.
Automotive Exhaust Systems
Our 309 stainless pipe is used in automotive exhaust systems for manifolds. It resists scaling in hot gases. Durability cuts replacement needs.
Food Processing
Our 309 SS pipe is used in heat exchangers and in food processing equipment. Corrosion resistance helps in maintaining hygiene and cleanliness. It also meets health and safety regulations.
Pulp & Paper Industry
Stainless steel 309 pipes are used in the pulp and paper industry in piping systems that transport corrosive chemicals and operate under high-temperature conditions.
Frequently Asked Questions
-
Where to Buy Stainless Steel 309 Seamless Pipes in China?
-
What is the minimum order quantity for stainless steel 309 seamless pipes?We maintain a supply capacity of 25,000 tons and offer a minimum order quantity of 200 kg for products that are in stock. For customised orders, delivery is within a duration of 15 to 60 days.
-
What temperature can stainless steel 309 pipe withstand?Stainless steel 309 pipe can withstand continuous service temperatures up to about 1900°F (1038°C) and intermittent exposure up to around 2000°F (1093°C) in oxidising environments.