DONGSHANG Stainless offers welded and seamless large-diameter stainless steel pipe in a wide range, including heavy wall pipe and thin wall pipe, standard sizes and custom sizes are available, max outside diameter of 40 inch, and wall thickness of 70 mm. Large-diameter pipe is manufactured in accordance with most ASTM and International standards and specifications.
General stainless steel grades are 304, 304L, 316/316L, and other grades can be provided to meet the standards, Large-diameter stainless steel pipes have good corrosion resistance properties and enhanced adhesion properties to use in various environments. the big bore pipes are finished In-house pickling and passivating, In-house hydrostatic tests and In-house X-Ray tests are carried out to guarantee quality.
Large Diameter Stainless Steel Pipe Specifications
| Standard | ASTM A312, ASTM A778, ASTM A358, ASTM A999 |
|---|---|
| Pipe Type | Both Welded And Seamless |
| Grades | TP304, TP304L, TP316L, TP321 |
| Outside Diameter | Max 40″ |
| Wall Thickness | Max SCH XXS |
| Surface Finish | Annealing Pickling, Polishing |
Stainless Steel Pipe Sizes And Dimensions
Standard dimensions for welded and seamless wrought steel pipe for high or low temperatures and pressures are described in ASME B36.10. Standard dimensions for welded and seamless wrought stainless steel pipe are described in ASME B36.19. The suffix “S” in the Schedule Number differentiates the B36.19 pipe from the B36.10 pipe. ASME B36.10 includes other pipe thicknesses which are also commercially available with stainless steel material. For special use, heavy wall or light wall pipe can be provided, usually, it is round shape, plain end and beveled end are available.
- Outside diameter: min size 1/8 in., max size 40 in., DN6 to DN1000.
- Wall thickness: SCH 5, 5S, 10, 10S, 20, 30, 40, 40S, 60, 80, 80S, 100, 120, 140, 160, STD, XS and XXS, 1.24mm to 25.4mm.
- Cut to length: random length can be offered, max length can be 20 meters, and fixed pipe length is 6 meters.
Stainless Steel Grades
There are varieties of stainless steel grades to select from depending on application and cost consideration, overall, stainless steel possesses high strength and excellent properties to use in critical environments.
Major categories of stainless steel have Austenitic Stainless Steel, Martensitic stainless steel, Ferritic stainless steel and Duplex (ferritic-austenitic) stainless steels, the most used grade is 304 stainless steel, the second is 316 stainless steel, custom stainless steel grades with chemical composition are shown below.
| Grade | Carbon | Silicon | Manganese | Chromium | Nickel | Molybdenum | Sulfur | Phosphorous |
|---|---|---|---|---|---|---|---|---|
| TP304 | 0,08 | 1,0 | 2.00 | 18.0 – 20.0 | 8.0 – 11.0 | – | 0,03 | 0,045 |
| TP304L | 0,035 | 1,0 | 2.00 | 18.0 – 20.0 | 8.0 – 13.0 | – | 0,03 | 0,045 |
| TP316 | 0,08 | 1,0 | 2.00 | 16.0 – 18.0 | 10.0 – 14.0 | 2.00 – 3.00 | 0,03 | 0,045 |
| TP316L | 0,035 | 1,0 | 2.00 | 16.0 – 18.0 | 10.0 – 15.0 | 2.00 – 3.00 | 0,03 | 0,045 |
| TP321 | 0,08 | 1,0 | 2.00 | 17.0 – 19.0 | 9.0 – 12.0 | – | 0,03 | 0,045 |
304, 304L, 316L, 316H, 316Ti, 317L, 321, 347/347H, 904L, 254SMO/S31254, 309/309S, 310/310S, 409, 430, 439, 2205, S32750, S32760
Welded Large Diameter Stainless Steel Pipe
Welded pipe is made from stainless steel strip or plate, through rollers to form the desired shape, and welding longitudinally edges using TIG, EFW, EFW, LSAW, SSAW and other welding technologies, for large diameter pipe, double welding may be required.
- ASTM A312 – Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
- ASTM A778 – Welded, Unannealed Austenitic Stainless Steel Tubular Products
- ASTM A358 – Welded Stainless Steel Pipe for High-Temperature Service and General Applications
- ASTM A790 – Seamless and Welded Duplex Stainless Steel Pipe
- ASTM A814 – Standard Specification for Cold-Worked Welded Austenitic Stainless Steel Pipe
- JIS G3468 – Large diameter welded stainless steel pipes
Seamless Large Diameter Stainless Steel Pipe
Seamless pipe is manufactured from hollow billets, through cold finished and heat treatment process to obtain the desired pipe dimension, and with the manufacturing process together, seamless pipe technology can achieve heavy wall pipe.
- ASTM A312 – Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
- ASTM A376 – Seamless Stainless Steel Pipe for High-Temperature Central-Station Service
- ASTM A790 – Seamless and Welded Duplex Stainless Steel Pipe
Application And Usage
Stainless steel pipe is usually used to transport fluid, like water, oil and gas, they are connected by fittings and flanges to form a flow system.
Industrial Pipe is a tubular section or hollow cylinder, that is used to flow liquids to another place, sometimes small solid material, there are many industries to require pipe, such as petrochemical, energy, paper making, and water transportation.
We are a reliable stainless steel pipe supplier, having over 10 years of experience. We possess full sets of facilities to offer a wide range of sizes of pipe, small diameter and large-diameter pipes are available upon request.
Pipe Sizes and Dimensions
Industrial pipe sizes range from NPS 1/8 inch to NPS 48 inch in outside diameter, and wall thickness ranges from Sch 5 to Sch 160, including Schedule No. identified as Standard (STD), Extra Strong (XS) and Double Extra Strong (XXS), these sizes are specified in ANSI/ASME B36.10M standard.
NPS refers to Nominal Pipe Size, which defines the pipe outside, and Schedule defines the thickness, they have corresponding values in mm sizes, see ANSI Pipe Schedule B36.19 & B36.10.
Pipe sizes in NPS are often confused, less than NPS 14 inch size is not the actual diameter, and over NPS 14 inch size is the actual diameter, that must be noticed.
Specifications
Common manufacturing standard specification for stainless steel pipe is ASTM A312, other standards are available, such as ASTM A358, A778, these standards specify basic requirements, such as grades, sizes, tolerances, tests, and pipe should be manufactured in compliance with standards.
Industrial pipe can be welded pipe and seamless pipe, selecting which pipe depending on applications, generally, seamless pipe has higher strength than welded pipe, and may have a long lifetime, welded pipe is a cost-effective option, with welding technology improvement, in many conditions, welded pipe can replace seamless pipe.
Stainless Steel Grades
There are various stainless steel grades for industrial pipe, common grades include TP304, TP340L, TP316L, TP321, TP321H, TP347H, TP309S, and TP310S, duplex stainless steels are common grades used in harsh environments.