Your Professional 321 Stainless Steel Pipe Supplier
ALLOK (Jiaxing) Metal Materials Co.,Ltd. was built in 2018, it owns two production bases in Jiaxing city and Yancheng city, equipped with precision cold rolling machines, cold drawing machines, bright annealing furnace, ultrasonic cleaning tank, passivation tanks, multi-line electropolishing devices, ultrapure water preparation machine, dryer, clean room, eddy current testing detector, ultrasonic flaw detector and other equipment, focusing on the production of stainless steel tubes, stainless steel pipes and nickel alloy tubes. for non-standard products that need to be customized, we have the ability to sample and mass produce for customers in a relatively short period of time.
Why Choose Us
Rich Products
Our company can produce stainless steel tubes, nickel alloy tubes, electrolytic polished tubes, bright annealed tubes, stainless steel coils, stainless steel capillary tubes, alloy tubes, etc.
Products Widely Used
The products produced by our company can be widely used in the biopharmaceutical industry, fine chemical industry, semiconductor industry, instrumentation industry, gas engineering industry and aerospace industry.
Advanced Production Equipment
Our company has advanced production equipment, such as precision cold rolling mills, cold drawing machines, bright annealing furnaces, ultrasonic cleaning tanks, passivation tanks, multi-line electrolytic polishing devices, etc.
Quality Guaranteed
All products we produce have ISO9001:2015 certificates, and all products are strictly tested in accordance with industry standards and contract agreements before leaving the factory. MTC is provided, and third-party testing certificates can be provided when necessary.
Resistance to Intergranular Corrosion:
One of the key advantages of 321 stainless steel is its resistance to intergranular corrosion. The titanium in the alloy prevents the formation of chromium carbides at the grain boundaries, which commonly occurs in grades like 304 when exposed to temperatures between 800°F and 1500°F. This resistance ensures that 321 maintains its corrosion resistance even after welding or prolonged high-temperature exposure.
High-Temperature Strength
321 can withstand temperatures up to about 1500°F, making it suitable for high-heat applications where oxidation resistance is critical. Its high creep and stress rupture properties also ensure stability under long-term exposure to heat.
Good Weldability and Formability
Like other austenitic stainless steels, 321 is easily formed and welded, making it a versatile material for manufacturing and industrial processes. It can be used in both welding-heavy environments and applications requiring complex shapes.
Oxidation Resistance
321 offers good oxidation resistance, making it suitable for use in environments exposed to elevated temperatures and oxidizing atmospheres.
321 Stainless Steel Pipe Specification
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ASTM Specification |
ASTM A/ASME SA213/A249/A269/A312/A358 CL. I to V ASTM A789/A790 |
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Grade |
Stainless Steel 321 (1.4541, S32100), Stainless Steel 321H (S32109, 1.4878) |
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Standard |
ASTM, ASME, JIS, AISI, AMS, EN, SAE, DIN, NF, TOCT, DS, DTD, GB |
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DIN 1.4541 SS 321 Pipe Size |
4 to 219mm W. T.: 0.5 to 20mm |
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SS 321 Welded Pipe Size |
5.0 - 1219.2 mm |
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Astm a312 tp321 EFW Pipe size |
5.0 - 1219.2 mm |
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Swg & Bwg |
10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg. |
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Stainless steel astm a312 tp321 Pipe Schedule |
SCH5, SCH10, SCH10S, SCH20, SCH30, SCH40, SCH40S, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
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Stainless Steel 321 Pipe Length |
Single Random, Double Random, Standard & Cut length Pipe |
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Finish |
Polished, AP (Annealed & Pickled), BA (Bright & Annealed), MF, NO.1, NO.4, 2B, BA, HL, 8K, Mirror finish, etc |
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Form |
Stainless Steel 321 Pipe are available in form of Round, Square, Hollow, Rectangular, Hydraulic, Coiled, Straight Pipes, “U” Shape, Pan Cake Coils etc. |
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Type of 321 SS Pipe |
Seamless / ERW/ EFW / Welded / Fabricated / CDW / DOM / CEW Stainless Steel 321 Pipe |
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Stainless Steel 321 Pipe End |
Plain End, Beveled End, Treaded Pipe, Screwed ends |
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Marking on astm a312 tp321 grade Pipe |
All Stainless Steel 321 Pipes are marked as follows: Standard, Grade, OD, Thickness, Length, Heat No. (Or according to the customer’s request.) |
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Application of Stainless Steel 321 Pipe |
Dairy Pipe, Oil Pipe, Gas Pipe, Fluid Pipe, Boiler Pipe for Chemical Industry |
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Value Added Service |
Draw & Expansion as per required Size & Length, Polish (Electro & Commercial) Annealed & Pickled Bending, Machining Etc. |
321 Stainless Steel Pipe Surface Finish
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Surface Finish |
Internal Surface(ID) |
Exterbal Surface(OD) |
|||
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Roughness Average(RA) |
Roughness Average(RA) |
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μ inch |
μm |
μ inch |
μm |
||
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AP |
Annealed & Pickled |
Not defined |
Not defined |
40 or Not defined |
1.0 or Not defined |
|
BA |
Beight Annealed |
40,32,25,20 |
1.0,0.8,0.6,0.5 |
32 |
0.8 |
|
MP |
Mechanical Polish |
40,32,25,20 |
1.0,0.8,0.6,0.5 |
32 |
0.8 |
|
EP |
Electro Polish |
15,10,7,5 |
0.38,0.25,0.20;0.13 |
32 |
0.8 |
Processing of 321 Stainless Steel Pipe
Forming
321 Stainless Steel Pipe offers good formability and can be readily formed using standard methods like bending, drawing, and pressing. It is less prone to work hardening compared to other austenitic grades, but moderate work hardening can still occur during cold forming. Intermediate annealing may be required for more complex shapes or extensive deformation. Post-forming annealing is recommended to relieve stress and restore full corrosion resistance, especially after severe cold working.
Welding
321 Stainless Steel Pipe can be welded easily using any standard fusion welding method, whether filler metals are used or not. Welding 321 stainless steel requires attention to its titanium stabilization to prevent carbide precipitation. Use 347 filler materials for better corrosion resistance. Preheating is generally unnecessary, but slow cooling can minimize stress. Post-weld heat treatment is not usually needed unless specific stress relief is required. The material resists cracking during welding, making it suitable for high-temperature applications.
Machining
321 Stainless Steel Pipe offers moderate machinability compared to other austenitic stainless steel. It is slightly harder to machine than 304 due to its titanium content, which enhances high-temperature performance but reduces machinability. Cutting speeds should be reduced by around 20% compared to 304 to prevent excessive tool wear. Proper lubrication and cooling are essential to manage heat and minimize work hardening, which can occur during cutting.
Common Applications of 321 Stainless Steel Pipe
Aerospace Industry:
321 stainless steel is frequently used in aircraft components such as exhaust systems and engine parts that are exposed to high temperatures. Its resistance to oxidation and strength retention at high temperatures makes it ideal for this purpose.
Chemical Processing Equipment:
321 stainless steel is often used in chemical processing plants where equipment needs to withstand high temperatures and corrosive substances. It is ideal for heat exchangers, pressure vessels, and storage tanks.
Thermal Equipment:
Boilers, heat exchangers, and furnace parts often utilize 321 stainless steel because of its excellent resistance to heat and oxidation. It is commonly found in industrial heat-treating equipment.
Petroleum and Refining Industry:
The petroleum industry benefits from 321 stainless steel for its ability to withstand high temperatures and resist corrosion, making it suitable for equipment such as piping, heat exchangers, and refining equipment.
Automotive Exhaust Systems:
321 stainless steel is used in automotive exhaust systems due to its ability to endure extreme heat and exposure to exhaust gases, prolonging the lifespan of exhaust components.
Expansion Joints:
The flexibility and high-temperature resistance of 321 make it a good choice for expansion joints, which are used in systems that require thermal expansion and contraction.
FAQ
We're well-known as one of the leading 321 stainless steel pipe manufacturers and suppliers in China. Please feel free to wholesale custom made 321 stainless steel pipe at competitive price from our factory.
321 Stainless Tubing