ASTM A312 Welded Stainless Steel Pipe in 304L & 316L

A312 welded stainless steel pipe in grades 304L and 316L, from 3/8″ to 24″ NB in schedules 10S, 20 and 40S. Held in stock in the UK and cut to the exact length you need.

Welded Pipe – ASTM A312 – Grades 304L & 316L - Taiwanese Origin

Our stainless steel pipe stock includes ASTM A312 welded pipe in grades 304L and 316L across a wide selection of nominal sizes and wall schedules.

We have the following sizes available:

  • 3/8″ NB to 12″ NB Schedule 10s
  • 1/2″ NB to 24″ NB Schedule 10s
  • 1/2″ NB to 24″ NB Schedule 40s
  • 8″ NB to 12″ NB Schedule 20

Please see the chart below for more detailed information.


Sch = Wall Thickness in Millimeters

Nominal Pipe Size Outside Diameter In MM SCH 10S SCH 20 STD SCH 40S
1/2" 21.34 2.11 2.77
3/4" 26.67 2.11 2.87
1" 33.40 2.77 3.38
1 1/4" 42.16 2.77 3.56
1 1/2" 48.26 2.77 3.68
2" 60.33 2.77 3.91
2 1/2" 73.03 3.05 5.16
3" 88.90 3.05 5.49
3 1/2" 101.60 3.05 5.74
4" 114.30 3.05 6.02
5" 141.30 3.40 6.55
6" 168.28 3.40 7.11
8" 219.08 3.76 6.35 8.18
10" 273.05 4.19 6.35 9.27
12" 323.85 4.57 6.35 9.53
14" 355.60 4.78 9.53
16" 406.40 4.78 9.53
18" 457.20 4.78 9.53
20" 508.00 5.54 9.53
24" 609.60 6.35 9.53

Although every effort has been made to give accurate information PipeXtra Stainless Ltd accepts no responsibility for any errors

A312 welded stainless steel pipe, cut to length

A312 welded stainless steel pipe in stock at PipeXtra
A312 welded stainless steel pipe from our stock

Can’t see the size you need? Just get in touch. As well as our stock range, we can have welded stainless steel pipe bespoke manufactured to any size and wall thickness. Send us your requirements or call 01254 672999.

Welded pipe is formed and welded along its length, making it a cost-effective alternative to seamless for most low and medium-pressure applications, particularly in larger sizes. Our A312 welded stock is of Taiwanese origin, in grades 304L and 316L.

We cut A312 welded stainless steel pipe to your exact lengths in-house, so you only buy what you need and avoid the cost of full lengths and offcuts.

All of our stainless steel pipe stock is supplied with full certification and traceability. We deliver next day anywhere in the UK, with fast deliveries to mainland Europe. PipeXtra is a member of the British Stainless Steel Association.

Calculate weights with our free stainless steel calculators, or request a quote with your sizes, schedules and lengths.

A312 welded pipe: your questions answered

When should I choose welded rather than seamless pipe?

Welded pipe suits most low and medium-pressure duties and is usually more economical, especially in larger diameters. Seamless pipe is generally specified for higher pressures or where a project requires it.

What sizes of A312 welded pipe do you stock?

3/8″ to 12″ NB in Schedule 10S, 1/2″ to 24″ NB in Schedules 10S and 40S, and 8″ to 12″ NB in Schedule 20. See the chart above for full details.

Can you cut welded pipe to length?

Yes. We cut to your exact lengths, whether you need one piece or a batch of cut lengths.

Is the pipe supplied with certificates?

Yes. All of our stainless steel pipe is supplied with full certification and traceability.

Need stainless pipe cut to length?

Send us your sizes and quantities and we’ll confirm price, availability and lead time.