304 316L 316 310S 321 904L Stainless Steel Pipe Tube ASTM Standard

All our stainless steel pipes/tubes are made of high-purity raw materials, with precise control of chemical composition to ensure stable performance, which fully complies with ASTM standard requirements. The detailed chemical composition of each grade is as follows:

• 304 Stainless Steel Pipe/Tube: Chromium (Cr): 18.00-20.00%, Nickel (Ni): 8.00-12.00%, Carbon (C): ≤0.08%, Manganese (Mn): ≤2.00%, Silicon (Si): ≤1.00%, Phosphorus (P): ≤0.045%, Sulfur (S): ≤0.030%. It is a universal austenitic stainless steel with excellent comprehensive performance, non-magnetic, and easy to process and weld.
• 316 Stainless Steel Pipe/Tube: Chromium (Cr): 16.00-18.00%, Nickel (Ni): 10.00-14.00%, Molybdenum (Mo): 2.00-3.00%, Carbon (C): ≤0.08%, Manganese (Mn): ≤2.00%, Silicon (Si): ≤1.00%, P: ≤0.045%, S: ≤0.030%. The addition of molybdenum significantly improves corrosion resistance, especially resistance to chloride ion corrosion, which is better than 304 grade.
• 316L Stainless Steel Pipe/Tube: On the basis of 316 grade, the carbon content is reduced to ≤0.03%, which effectively improves the intergranular corrosion resistance, is suitable for welding occasions without post-weld heat treatment, and has better toughness and corrosion resistance in low-temperature environments (-196℃~850℃).
• 310S Stainless Steel Pipe/Tube: Chromium (Cr): 24.00-26.00%, Nickel (Ni): 19.00-22.00%, Carbon (C): ≤0.08%, Manganese (Mn): ≤2.00%, Silicon (Si): ≤1.50%, P: ≤0.045%, S: ≤0.030%. It is a high-temperature resistant austenitic stainless steel, also known as "high-temperature stainless steel", with excellent high-temperature oxidation resistance and high-temperature strength, and can be used for a long time at 1200℃.
• 321 Stainless Steel Pipe/Tube: Chromium (Cr): 17.00-19.00%, Nickel (Ni): 9.00-12.00%, Titanium (Ti): 5×C~0.70%, Carbon (C): ≤0.08%, Manganese (Mn): ≤2.00%, Silicon (Si): ≤1.00%, P: ≤0.045%, S: ≤0.030%. Titanium is added as a stabilizer to prevent intergranular corrosion, and it has excellent corrosion resistance and high-temperature strength in the range of 600-800℃, which is better than 304 grade in high-temperature environments.
• 904L Stainless Steel Pipe/Tube: Chromium (Cr): 21.00-23.00%, Nickel (Ni): 24.00-26.00%, Molybdenum (Mo): 4.00-5.00%, Copper (Cu): 1.00-2.00%, Carbon (C): ≤0.02%, Manganese (Mn): ≤2.00%, Silicon (Si): ≤1.00%, P: ≤0.030%, S: ≤0.015%. It is a super austenitic stainless steel with low carbon and high alloy, corrosion resistance close to nickel-based alloys, and excellent resistance to dilute sulfuric acid, phosphoric acid, mixed acid corrosion, as well as pitting and crevice corrosion resistance.

All products undergo strict mechanical property testing, and the indicators fully meet the requirements of ASTM standards, ensuring stable and reliable use in various harsh environments. The key mechanical properties are as follows:

• Tensile Strength (σb): 304/304L: ≥515MPa; 316/316L: ≥515MPa; 310S: ≥515MPa; 321: ≥515MPa; 904L: ≥490MPa.
• Yield Strength (σ0.2): 304: ≥205MPa; 304L: ≥170MPa; 316: ≥205MPa; 316L: ≥170MPa; 310S: ≥205MPa; 321: ≥205MPa; 904L: ≥240MPa.
• Elongation (δ5): 304/304L/316/316L/310S/321: ≥40%; 904L: ≥45%.
• Hardness: Brinell Hardness (HB): ≤201 (304/316/321); ≤217 (310S); ≤220 (904L); Rockwell Hardness (HRB): ≤92 (all grades). Different hardness testing methods can be selected according to pipe specifications, such as Vickers hardness test for thin-walled pipes and Brinell hardness test for thick-walled pipes.
• Impact Toughness (Akv): ≥60J (at room temperature); at low temperature (-196℃), 304L/316L/904L still maintain good toughness, Akv ≥40J, suitable for low-temperature working environments.

• Production Process: We adopt advanced production processes, including seamless pipe (hot rolling, cold rolling, cold drawing) and welded pipe (electric fusion welding, TIG welding, MIG welding), which can be customized according to customer needs. The seamless pipe production process includes round steel preparation, heating, hot rolling piercing, heading, pickling, grinding, lubrication, cold rolling, degreasing, solution heat treatment, straightening, pipe cutting, pickling and finished product inspection; the welded pipe production process includes raw material slitting, welding pipe making, heat treatment, straightening, end trimming, pickling, hydrostatic testing, inspection and packaging.
• Welding Quality: For welded pipes, we strictly implement the classification requirements of ASTM A358/A358M-24 standard, including Class 1 (double welding, full radiography), Class 2 (double welding, no radiography), Class 3 (single welding, full radiography), Class 4 (single welding, inner weld may be without filler metal) and Class 5 (double welding, spot radiography). Weld defects are repaired by removing to sound metal and rewelding, and subsequent heat treatment is carried out according to the requirements of the original welds.
• Dimensional Accuracy: Strictly in line with ASTM standard requirements, the outer diameter (OD) tolerance: ±0.02mm~±0.10mm (depending on the specification); wall thickness (WT) tolerance: ±5%~±10% (ASTM A312 standard); length tolerance: ±1mm~±5mm (customizable according to customer requirements). The pipe end is processed with beveling, flat end, thread (BSP, NPT) and other forms, with smooth surface and no burrs, ensuring good connection performance.
• Heat Treatment: According to the material grade and application requirements, solution heat treatment (1050℃~1150℃, rapid cooling) is adopted to eliminate internal stress, improve corrosion resistance and mechanical properties; 321 and 310S grades are additionally subjected to stabilization heat treatment to further enhance high-temperature performance.

We provide a variety of surface treatment options to meet the needs of different application scenarios, all of which comply with ASTM standard environmental protection requirements:

• 2B Surface: Smooth and flat, with uniform luster, low surface roughness (Ra≤0.8μm), suitable for food, medical, decorative and other fields that require high surface quality.
• BA Surface: Bright as a mirror, surface roughness (Ra≤0.2μm), after bright annealing treatment, no oxidation layer, suitable for precision instruments, high-end decorative, pharmaceutical and other fields.
• Polished Surface: Polished to 400#~1200# brightness, optional matte, semi-bright, full bright, with strong corrosion resistance and aesthetic performance, suitable for decorative, food processing, chemical and other fields.
• Pickled Surface: After pickling and passivation treatment, the surface forms a uniform passive film, which effectively improves corrosion resistance, suitable for industrial pipelines, chemical equipment and other fields that do not require high surface brightness.
• Sandblasted Surface: Uniform sandblasting treatment, matte surface, good adhesion, suitable for occasions that need to be painted or sprayed later.

Different material grades have targeted corrosion resistance, fully adapting to various harsh corrosion environments, and complying with ASTM standard corrosion resistance test requirements:

• 304: Excellent resistance to atmospheric, fresh water, steam and weak acid (dilute nitric acid, acetic acid) corrosion, not suitable for environments with high chloride ion content (such as seawater, salt spray).
• 316/316L: Due to the addition of molybdenum, it has excellent resistance to chloride ion corrosion, seawater corrosion, salt spray corrosion and medium concentration acid-base corrosion, suitable for marine environment, chemical industry, coastal engineering and other fields. 316L has better intergranular corrosion resistance than 316.
• 310S: Excellent high-temperature oxidation resistance and high-temperature corrosion resistance (such as sulfide corrosion), can resist the corrosion of high-temperature flue gas, molten metal and other media, suitable for high-temperature industrial fields such as furnace pipes and incinerators.
• 321: Good intergranular corrosion resistance and high-temperature corrosion resistance, can resist the corrosion of high-temperature steam and oxidizing media, suitable for high-temperature pipelines such as boiler superheaters and heat treatment equipment.
• 904L: Super corrosion resistance, can resist the corrosion of dilute sulfuric acid, phosphoric acid, formic acid, acetic acid and other strong corrosive media, as well as pitting and crevice corrosion, suitable for extreme corrosion environments such as petrochemical, wet metallurgy and pharmaceutical industries.

• Low-Temperature Resistance: 304L/316L/904L have excellent low-temperature toughness, can work stably at -196℃ (liquid nitrogen temperature), no brittle fracture, suitable for low-temperature storage, cryogenic equipment and other fields.
• High-Temperature Resistance: 304/316: Long-term service temperature ≤800℃; 316L: ≤850℃; 321: ≤900℃; 310S: ≤1200℃ (short-term service can reach 1300℃), suitable for high-temperature furnaces, boiler pipes, high-temperature flue gas pipelines and other fields.

We provide a full range of specifications, and can also customize non-standard specifications according to customer drawings and requirements, all in line with ASTM standards (ASTM A312, ASTM A213, ASTM A358, etc.):

• Seamless Stainless Steel Pipe/Tube: Hot-rolled seamless pipe, cold-rolled seamless pipe, cold-drawn seamless pipe.
• Welded Stainless Steel Pipe/Tube: Electric fusion welded pipe, TIG welded pipe, MIG welded pipe, straight seam welded pipe, spiral welded pipe (complying with ASTM A358/A358M-24 standard classification requirements).

• Outer Diameter (OD): 6mm~630mm (seamless pipe); 10mm~2000mm (welded pipe), can be customized according to customer needs.
• Wall Thickness (WT): 0.5mm~50mm, including thin-walled pipe (≤3mm), medium-thick wall pipe (3mm~10mm), thick-walled pipe (>10mm), in line with ASTM SCH series specifications (SCH5S, SCH10S, SCH20S, SCH40S, SCH80S, etc.).
• Length: Standard length (6m, 12m), can be customized to 1m~12m, and can also be cut into fixed length according to customer requirements (tolerance ±1mm).
• Cross-Section Shape: Round pipe (standard), square pipe, rectangular pipe, oval pipe, hexagonal pipe and other special-shaped pipes (customizable).
• Pipe End Treatment: Plain end, beveled end (30°, 45°, 60°), threaded end (BSPP, BSPT, NPT), flanged end, etc., to meet different connection needs.

According to ASTM standard and wall thickness, the pressure rating ranges from 0.6MPa to 100MPa, which can be customized according to the working pressure requirements of the customer's equipment. All products pass the hydrostatic test (test pressure is 1.5 times the working pressure) to ensure no leakage, in line with the test requirements of ASTM standards.

All our stainless steel pipes/tubes are strictly manufactured and tested in accordance with ASTM standards, and can provide relevant test reports and certification documents to ensure product compliance and reliability. The main applicable ASTM standards are as follows:

• ASTM A312: Standard Specification for Seamless and Welded Austenitic Stainless Steel Pipes for High-Temperature and Corrosive Service.
• ASTM A358/A358M-24: Standard Specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications, covering five classes of welded pipes, with strict requirements for welding process and quality inspection.
• ASTM A213: Standard Specification for Seamless Austenitic and Ferritic Alloy Steel Boiler, Superheater, and Heat-Exchanger Tubes.
• ASTM A480: Standard Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip (for surface quality and dimensional tolerance reference).

All products pass strict quality inspection, including chemical composition analysis, mechanical property test (tensile test, yield test, elongation test, impact test), hardness test, hydrostatic test, non-destructive testing (eddy current testing, ultrasonic testing, radiography testing), surface quality inspection, dimensional accuracy inspection, etc., to ensure that each batch of products meets ASTM standard requirements and customer needs.

Due to the excellent performance of different material grades, our stainless steel pipes/tubes are widely used in various industrial fields and daily life, covering:

• Chemical Industry: Transportation of corrosive media (acid, alkali, salt solution), chemical reaction vessels, pipeline systems, suitable for 316L, 904L grades.
• Petrochemical Industry: Oil and gas transportation, refinery equipment, offshore oil platforms, pipeline systems, suitable for 316, 316L, 904L grades.
• Food and Beverage Industry: Food processing equipment, beverage transportation pipelines, dairy equipment, kitchen utensils, suitable for 304, 316L grades (food-grade certification available).
• Medical Industry: Medical equipment, sterile pipelines, pharmaceutical production equipment, suitable for 316L, 304 grades (meets medical-grade hygiene standards).
• High-Temperature Industry: Boiler superheaters, high-temperature furnaces, heat exchangers, high-temperature flue gas pipelines, suitable for 310S, 321 grades.
• Marine Engineering: Offshore platforms, seawater desalination equipment, marine pipelines, coastal buildings, suitable for 316, 316L, 904L grades.
• Construction and Decoration: Building handrails, decorative pipelines, curtain wall supports, water supply and drainage pipelines, suitable for 304, 316 grades.
• Cryogenic Industry: Low-temperature storage tanks, cryogenic pipelines, liquid nitrogen transportation equipment, suitable for 304L, 316L, 904L grades.
• Other Fields: Aerospace, automotive industry, precision instruments, water treatment equipment, etc., can be selected according to specific working conditions.

As a direct manufacturer, we have our own production workshop, advanced production equipment and professional technical team, eliminating middlemen links, and providing customers with factory-direct prices, which can save 15%~30% of procurement costs. At the same time, we have a large inventory of raw materials and finished products, which can meet the needs of large-quantity and urgent orders, and ensure timely delivery.

All products are made of high-quality stainless steel raw materials, strictly in accordance with ASTM standards for production and testing, and provide quality assurance certificates (QA/QC), chemical composition test reports, mechanical property test reports, non-destructive testing reports and other relevant documents. If there is any quality problem (non-human damage), we will provide replacement, repair or refund services in accordance with the contract.

We can customize stainless steel pipes/tubes of different material grades, specifications, surface treatments, pipe end forms and lengths according to customer drawings, samples and specific requirements, and provide professional technical guidance to help customers select the most suitable product specifications and material grades according to their working conditions.

We have a professional after-sales service team, which can provide technical consultation, installation guidance, maintenance and other services. For customer questions and needs, we will respond within 24 hours and provide solutions in a timely manner to ensure the smooth use of products by customers.

• High Quality: Strictly comply with ASTM standards, raw material quality control, precision production, and multiple inspections to ensure stable product performance.
• Cost-Effective: Factory direct price, no middlemen, high cost performance, suitable for large-quantity procurement.
• Full Specifications: Cover 304, 316L, 316, 310S, 321, 904L grades, various specifications and surface treatments, customizable.
• Strong Adaptability: Excellent corrosion resistance, high and low temperature resistance, suitable for various harsh working environments.
• Reliable Certification: Provide relevant test reports and certification documents to meet the requirements of various industries.

We are committed to providing global customers with high-quality, cost-effective ASTM standard stainless steel pipes/tubes, with professional technology, thoughtful service and reliable quality, to become your trusted long-term cooperative partner. If you have any needs for product specifications, quotes or customization, please contact us at any time, and we will provide you with the best solution!