Gallery of Size Tables according to ASME B36.10

Stainless Steel Pipe and Tube
Tube and U-tube for Heat Exchanger
Precision Tube for equipments
Austenitic & Duplex & Super Duplex Stainless

Large inventory, Large sizes, Cutting Service!


In addition to Round pipe, we also stock Square and Rectangle. What's more, we also supply section pipe,such as oval.Walmi produce stainless steel pipe and tube as per ASTM A312/ASME SA312, A269 together with A213. The grades include an extensive material of austenitic stainless steel, such as 304/304L,316/316L, 310S,317L,321 etc. Additionally, we also supply duplex stainless steel S31803/S32205, super duplex stainless steel S32750 as well as high-alloy austenitic stainless steel 904L.Sizes range from 12mm to 813mm ( NPS 1/4”-DN8 to NPS 32”-DN800) outside diameter with a full pipes schedules ranging from sch5S through double extra heavy.Walmi always delivery stainless pipes in 6m fixed length as well as 5.0m-7.0m random length. But Walmi can supply tubes in most grades exceeding 20m long. What's more, we also supply cutting service to meet customer’s exact requirements.The Stainless Steel pipes are austenitic stainless light-weight steel pipes which are always used at high temperature and general corrosive service.  Customers use them extensively in the industries of Process, Chemical, Petrochemical, Pharmaceutical and food. We also have many advantages on stainless steel tubes for heat exchangers, boilers and pressure vessels.

Stainless Steel Flanges as A182
Steel Flange as per A105
Tube sheet & Baffle   
Non-standard Flanges to OEM drawings

No MOQ, Fast delivery, Factory Price!




Walmi  is a manufacturer of tube sheet, baffle and stainless steel flanges. We produce the steel flange as per B16.5., EN 1092-1 as well as non-standard sizes flanges are available.Walmi supply a wide variety of stainless steel flanges to compliment our pipe products, please find more details below:

1. Not only Slip-on flanges, but also welding neck flanges and socket welding flanges.
2. Threaded flanges, lap joint flanges as well as blind flanges
3. Hard-to-find configurations and sizes flanges are supplied by us too. 
4. Moreover, Tube sheet and baffle with drilling holes are supplied together with special size flanges for heat exchangers, boilers. What's more, stainless steel tubes and U tube are supplied together for one stop service. As a result, we help customers to save both cost and delivery time.

Flanges Specifications:

• Forged stainless steel material conforms to ASME A182 and equally.
• Stainless steel flanges dimensions conform to ASME B16.5 and ASME 16.47 additionally.
• NPT Threads conform to ASME B1.20.1
• Raised face and smooth finish
• Austenitic Stainless Steel is our main products, but carbon steel is also available . 
• Up to 2000mm( 80"), Class 150,300,600,900,1500,2500 LBS.

• Manufacturing facility is ISO 9001:2015 instead of 2008

• Certified according to EN 10204/3.1.

Stainless Steel Tubing
straight & U type Tube Sheet
Baffle, Flanges for pressure vessel, boiler
heat exchangers 100% Stress Relieved, 100% Hydrostatic Test Top Quality

Factory price, One-stop service!


Walmi produce stainless steel tubing for Boiler, Super Heater and pressure vessel as well as Heat-exchangers. In addition tube,U/U-bending/U-bends/U-type tube are also available.Sizes range from 12mm to 813mm ( NPS 1/4”-DN8 to NPS 32”-DN800) outside diameter with a full pipes schedules ranging from sch5S through double extra heavy.Walmi provide one-stop service for tube sheet, baffle and flanges together with tubes. Not only tubings, but also shells and heads with U-stamp are supplied by us. In a word, whatever you need for heat exchangers, walmi support it accordingly.First, we produce and test all tubes strictly as A213. The materials include 304, 316L,304H, 321 and 347 as well as 904L. We do 100% Hydrostatic testing for all tubes as well as 100% stress relieved for U-Bending part.Second, sizes range from 8mm to 38 mm ( NPS 1/4”- DN8 to NPS 1 1/4”- DN32) outside diameter, with a full tubes schedules ranging from sch10S through double extra heavy.Third, the stainless steel tubings are delivered in fixed lengths too. What’s more, Walmi can supply tubes exceeding 35m long. Additionally, all tubes can be cut to customer’s exact requirements.As a matter of fact, our prices are competitive due to all products from the largest products center worldwide!

Stainless Steel Hollow Bar
Stainless Steel Mechanical Tubing
304 / 304L 316 / 316L / 316Ti
S31803／S32205 / S32750 / 904L

Low MOQ, Cutting service, Factory price!





Walmi produce stainless steel hollow bar as A511, and we also call them mechanical tubing. The materials are austenitic steel, including 304/304L,316/316L etc. Duplex stainless S31803/S32205, together with super duplex S32750 are supplied. Additionally, we also supply 904L/UNS N08904.The most important is, corrosion test according to G-48 A and NACE MR 0175 / ISO 15156.We always use stainless steel hollow bar to produce machined components. What's more, we use hollow products in corrosion conditions.As a matter of fact, customers widely use stainless steel hollow bar in the industries of Chemical, Petrochemical and Power.As you know, stainless steel hollow bar is economic, it is efficient, it is always sensible to use hollow bar instead solid bar, because it reduces machining requirements， as well as minimizes waste again.Walmi not only delivery hollow bar in 4.0m-8.0m random length, but also cut them to fixed length.Moreover, you can find hollow bar advantages below:♦ First, fast delivery, customer needn't to keep stock.♦ Second, No MOQ, Walmi accept 1 piece order.♦ Third, easy handling due to low weight.♦ Fourth, short production time.

Stainless Steel Pipe Fittings as A403
Butt-welding fittings as B16.9
Elbow | Tee | Cross  | Reducer
Lap Joint | Stub End | Cap

No MOQ, Top Quality, Fast Delivery!





Walmi supply stainless steel pipe fittings together with pipes. They are industry pipes and fittings with very good resistance to corrosion.The most important is, Walmi has an extensive inventory of finished ss fittings as well as half-finished ones. Such as elbows, caps, tees, reducers, crosses, stub ends and many other steel pipe fittings as well. We not only widely use them in power plant, oil & gas, water treatment industries, but also food processing,automobile, petrochemical, LNG industries, heavy engineering, offshore and chemical together.What's more, stainless steel pipe fittings can be supplied by us as stand-alone orders or together with our other piping products. As a matter of fact, we also supply stainless steel tubing, tube sheet, baffle and flanges for one stop service too.SPECIFICATIONFirst, materials conform to ASTM A403/ASME SA403, MSS SP-43, including austenitic stainless steels WP304/304L,WP316/316L,WP321,WP347 and WP310S; As well as duplex stainless steels S31803/S32205/S2205; together with super-duplex stainless steels UNS S32750/S2507 /S32507 too.Second, dimensions conform to ASME/ANSI B16.9 (except thin Wall) and MSS SP-43Third, End type: BeveledFourth, Up to 80″ listed- Larger sizes availableMoreover, Customized or bespoke elbows of customer drawing are available as well.In addition, Certified to EN 10204/3.1 or equally.