ASTM A789 A312 Steel Pipe
What is ASTM A789 A312
ASTM A312 is a standard for austenitic stainless steel tubes published by the American Society for Testing and Materials (ASTM). It covers seamless, welded, and cold-worked tubes and is suitable for high-temperature and general corrosive conditions. Common grades include 304 and 316.
ASTM A789 is a general-purpose standard for duplex stainless steel (ferritic + austenitic) tubes, also including seamless and welded tubes, balancing high strength and excellent corrosion resistance.
Both are internationally recognized stainless steel tube specifications; the core difference lies in their material systems: A312 is for pure austenitic steels, while A789 is for duplex steels. What we offer is ASTM A789 and A312 seamless stainless steel pipe.
Specification of marine seamless stainless steel pipe
Standards | Grades | Out Diameter and Wall Thickness | Certificates |
A312 | TP304L,TP316L | O.D. 323.9 mm, W.T. 12.7mm | ABS, DNV, BV, RINA, LR, KR, CCS, NK |
A789 | S32205 | O.D. 323.9 mm, W.T. 12.7 mm | |
O.D. 168.3mm, W.T. 7.11mm | |||
O.D. 21.3mm, W.T. 1.65mm |
Applications
TP316L
Seawater/Cooling Systems: Seawater cooling pipes, intercoolers, condensers, freshwater cooling pipes, resistant to chloride ion pitting.
Ballast and Firefighting: Ballast water pipes, fire hoses, foam extinguishing system pipes.
Cargo Oil/Chemical Tankers: Product oil and chemical transfer pipes, cargo pump room pipes (resistant to corrosive media).
Living and Sanitation: Drinking water, galley/laundry, sanitation system pipes (sanitary grade, rust-free).
Deck and Equipment: Deck washing, hydraulic/pneumatic control, instrumentation and sampling pipes.
Exhaust and Thermal Systems: Main engine/auxiliary engine exhaust, steam tracing, exhaust gas treatment pipes (high temperature resistant).
TP314
High Temperature/Flue Gas Systems: Boilers, superheaters, exhaust gas boilers, flues, heat exchangers.
Engine Room Thermal Piping: Steam, hot oil, high-temperature media transport.
Special Corrosive Conditions: Sulfur/acidic flue gas, high-temperature condensate system.
S2205
Seawater Systems: Seawater cooling pipes, coolers, water generators, subsea valve box piping; resistant to chloride ion corrosion.
Ballast and Firefighting: Ballast water systems, fire hoses, deck washing piping; suitable for high-pressure, high-salt-spray environments.
Exhaust Gas Scrubbers (EGCS): Spray piping, circulation systems; resistant to acidic seawater corrosion.
Chemical/Oil Tankers: Liquid cargo transfer pipes, tank washing systems, heating coils; resistant to media corrosion and high strength.
Critical Structures/Components: Seawater zone flanges, fasteners, supports; resistant to stress corrosion and cracking.
Marine Certificates
Ships operate under high pressure, seawater corrosion, vibration, alternating loads, and salt spray for extended periods. ASTM standards only specify the basic properties of materials; classification society certification additionally audits the factory's qualifications, production process, and full-process testing (non-destructive, mechanical, corrosion, and heat treatment) to ensure that each batch of products is safe and reliable in the marine environment.
Factory show
Packaging&Delivery
Our marine-grade stainless steel seamless pipes are packaged in strict accordance with classification society and marine transport regulations. Delivery time is affected by various factors such as material, specifications, inspection, and order size, with a typical cycle of 8-19 days, which can be shortened if there is inventory.
We recommend planning ahead and clarifying your needs. We will also actively prepare production according to the contract to ensure that the project schedule is not affected.
Our service
1. Customized Production: We offer seamless marine-grade stainless steel pipes such as TP304/316L and S2205 according to ASTM A312, A789, and other standards. Customization options include outer diameter, wall thickness, length, beveling, polishing, and pickling/passivation.
2. Classification Society Certifications and Certificates: Providing factory approvals, type approvals, and product certificates from major classification societies such as ABS, LR, DNV, BV, and CCS. Full cooperation with surveyors for inspection and witnessed testing.
3. Comprehensive Quality Control: From raw materials to finished products, we perform physical and chemical tests, tensile tests, impact tests, hardness tests, intergranular corrosion tests, hydrostatic tests, and UT/ET non-destructive testing, providing complete quality assurance certificates.
4. Professional Ocean Freight Packaging: VCI rust-proof film, pipe end protective caps, and strapping/wooden crate packaging to meet the requirements of ocean shipping and warehousing.
5. One-stop Export Service: Customs declaration, inspection, certificate of origin, logistics booking, bill of lading preparation, and destination port customs clearance documentation support. We support various trade terms including FOB, CIF, and CFR.
6. Technical Support and Selection: We provide material selection, wall thickness calculation, standard matching, and installation suggestions based on ship systems (seawater cooling, ballast, fire protection, EGCS desulfurization).
7. Sample and Small-batch Support: We provide samples and sample tubes to support pre-project testing, shipowner approval, and small-batch trial orders.
8. Stable Delivery Time and After-sales Service: Large-scale production guarantees delivery time. We support quality feedback, document completion, and rapid handling of after-sales issues upon arrival.
Original source: https://www.marinesteelpipe.com/product/astm-a789-a312-steel-pipe.html
What is ASTM A789 A312
ASTM A312 is a standard for austenitic stainless steel tubes published by the American Society for Testing and Materials (ASTM). It covers seamless, welded, and cold-worked tubes and is suitable for high-temperature and general corrosive conditions. Common grades include 304 and 316.
ASTM A789 is a general-purpose standard for duplex stainless steel (ferritic + austenitic) tubes, also including seamless and welded tubes, balancing high strength and excellent corrosion resistance.
Both are internationally recognized stainless steel tube specifications; the core difference lies in their material systems: A312 is for pure austenitic steels, while A789 is for duplex steels. What we offer is ASTM A789 and A312 seamless stainless steel pipe.
Specification of marine seamless stainless steel pipe
Standards | Grades | Out Diameter and Wall Thickness | Certificates |
A312 | TP304L,TP316L | O.D. 323.9 mm, W.T. 12.7mm | ABS, DNV, BV, RINA, LR, KR, CCS, NK |
A789 | S32205 | O.D. 323.9 mm, W.T. 12.7 mm | |
O.D. 168.3mm, W.T. 7.11mm | |||
O.D. 21.3mm, W.T. 1.65mm |
Applications
TP316L
Seawater/Cooling Systems: Seawater cooling pipes, intercoolers, condensers, freshwater cooling pipes, resistant to chloride ion pitting.
Ballast and Firefighting: Ballast water pipes, fire hoses, foam extinguishing system pipes.
Cargo Oil/Chemical Tankers: Product oil and chemical transfer pipes, cargo pump room pipes (resistant to corrosive media).
Living and Sanitation: Drinking water, galley/laundry, sanitation system pipes (sanitary grade, rust-free).
Deck and Equipment: Deck washing, hydraulic/pneumatic control, instrumentation and sampling pipes.
Exhaust and Thermal Systems: Main engine/auxiliary engine exhaust, steam tracing, exhaust gas treatment pipes (high temperature resistant).
TP314
High Temperature/Flue Gas Systems: Boilers, superheaters, exhaust gas boilers, flues, heat exchangers.
Engine Room Thermal Piping: Steam, hot oil, high-temperature media transport.
Special Corrosive Conditions: Sulfur/acidic flue gas, high-temperature condensate system.
S2205
Seawater Systems: Seawater cooling pipes, coolers, water generators, subsea valve box piping; resistant to chloride ion corrosion.
Ballast and Firefighting: Ballast water systems, fire hoses, deck washing piping; suitable for high-pressure, high-salt-spray environments.
Exhaust Gas Scrubbers (EGCS): Spray piping, circulation systems; resistant to acidic seawater corrosion.
Chemical/Oil Tankers: Liquid cargo transfer pipes, tank washing systems, heating coils; resistant to media corrosion and high strength.
Critical Structures/Components: Seawater zone flanges, fasteners, supports; resistant to stress corrosion and cracking.
Marine Certificates
Ships operate under high pressure, seawater corrosion, vibration, alternating loads, and salt spray for extended periods. ASTM standards only specify the basic properties of materials; classification society certification additionally audits the factory's qualifications, production process, and full-process testing (non-destructive, mechanical, corrosion, and heat treatment) to ensure that each batch of products is safe and reliable in the marine environment.
Factory show
Packaging&Delivery
Our marine-grade stainless steel seamless pipes are packaged in strict accordance with classification society and marine transport regulations. Delivery time is affected by various factors such as material, specifications, inspection, and order size, with a typical cycle of 8-19 days, which can be shortened if there is inventory.
We recommend planning ahead and clarifying your needs. We will also actively prepare production according to the contract to ensure that the project schedule is not affected.
Our service
1. Customized Production: We offer seamless marine-grade stainless steel pipes such as TP304/316L and S2205 according to ASTM A312, A789, and other standards. Customization options include outer diameter, wall thickness, length, beveling, polishing, and pickling/passivation.
2. Classification Society Certifications and Certificates: Providing factory approvals, type approvals, and product certificates from major classification societies such as ABS, LR, DNV, BV, and CCS. Full cooperation with surveyors for inspection and witnessed testing.
3. Comprehensive Quality Control: From raw materials to finished products, we perform physical and chemical tests, tensile tests, impact tests, hardness tests, intergranular corrosion tests, hydrostatic tests, and UT/ET non-destructive testing, providing complete quality assurance certificates.
4. Professional Ocean Freight Packaging: VCI rust-proof film, pipe end protective caps, and strapping/wooden crate packaging to meet the requirements of ocean shipping and warehousing.
5. One-stop Export Service: Customs declaration, inspection, certificate of origin, logistics booking, bill of lading preparation, and destination port customs clearance documentation support. We support various trade terms including FOB, CIF, and CFR.
6. Technical Support and Selection: We provide material selection, wall thickness calculation, standard matching, and installation suggestions based on ship systems (seawater cooling, ballast, fire protection, EGCS desulfurization).
7. Sample and Small-batch Support: We provide samples and sample tubes to support pre-project testing, shipowner approval, and small-batch trial orders.
8. Stable Delivery Time and After-sales Service: Large-scale production guarantees delivery time. We support quality feedback, document completion, and rapid handling of after-sales issues upon arrival.