Seamless Stainless Steel Pipes
Koryo Steel stocks stainless steel Seamless pipe per ASTM A 312 in 304/304L and 316/316L. We supply other stainless grades, including 304H, 316H, 309/S, 310/S, 317/L, 321/H, 347/H, 904L, 330, 254SMO, 410. In duplex grades, we can supply 2205 and 2507. Some nickel grades are also supplied.
We supply a full range of pipe schedules ranging from Sch 5 thru Double Extra Heavy. Most products are available in 20′ random length sections, but Koryo Steel can supply stainless steel seamless pipe in most stainless grades in sections exceeding 40′. All stainless steel seamless pipes can be cut to your exact requirements. Some made to order items can be produced in 2-3 weeks.
Stainless Steel Seamless Pipe Overview
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|---|---|---|
Diameter of Stainless Pipe |
1/8″ thru 24″ | |
300 Series Stainless Steel Grades |
304 – 304/L – 304H – 309/S – 309H – 310/S – 310H – 316L – 317L – 321 – 321H – 347 – 347H | |
400 Series Stainless Steel Grades |
410 | |
Nickel Alloy Grades |
Alloy 20 – 200 – 400 – 600 – 601 – 625 – 825H – 825HT – C276 | |
Stainless Steel Seamless Pipe Processing
Long Product Processing Services Overview |
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|---|---|---|
Bar & Structural Cutting |
Products cut include Round Bar, Flat bar, Hex bar, Square bar, Tubing and Hollow Bar, Pipe, Angles, channels, Beams and Tees. Thickness range is 1/16″ to 28″ diameter | |
Production Cutting |
Penn Stainless can provide production cutting for product diameters up to 4″. We utilize Amanda Production Equipment to achieve these precision cuts with tight tolerances. | |
Pipe Threading |
Available thru 2″ in Diameter/All schedules | |
Tubular Polishing |
Products polished included all tubular products, with OD & ID polishing available, Round Bar, Square Bar, Hex & Flat bar, Angles, Uneven Leg Angles, beams, and other shapes. | |
Seamless Pipe Value Add
Stainless Steel Value Add |
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Stainless Steel Pipe Polishing |
Penn Stainless can polish nearly any stainless steel pipe item to a #4 polish, #6 Polish, #7 polish or a #8 mirror finish. Stainless steel polished pipes can also be cut to size. | ||
Stainless Steel Pipe Beveling |
Penn Stainless can bevel the edges of stainless steel plate to prepare for welding or other processes. | ||
Stainless Steel Pipe Honing & Turning |
Penn Stainless can hone pipe and tube, using a precision abrasion process in order to obtain a desired finish or close dimensional tolerance. | ||
Heatreating & Annealing |
Some grades of stainless steel pipe can be heatreated to change the mechanical properties. | ||
Positive Material Identification (PMI) |
Penn Stainless can perform PMI testing in house for most stainless steel grades, or we can work with independent labs to complete PMI in order to meet customer specifications. | ||
UT Testing |
In some cases, UT testing of the stainless steel plates may be required. We can assist you with this requirement. | ||
mless Pipe: Stainless Steel Grades, Thicknesses and Widths
- Let Penn Stainless cut your next seamless pipe requirement to your exact dimensions.
- All Schedules stocked including Sch 5 thru DXH.
- Yes, even 24” DXH seamless pipe can be supplied with short lead times
- Take advantage of our Domestic and International seamless stainless pipe mills to supply non standard wall thicknesses, lengths or chemistry.
- Special Testing is available upon request.
Stainless Steel Seamless Pipe Tolerances
NPS Designator |
Permissible Variations in Outside Diameter |
|
|---|---|---|
| Over In. | Under In. | |
| 1/8 to 1-1/2, incl | 1/64 (0.015) | 1/32 (0.031) |
| Over 1-1/2 to 4, incl | 1/32 (0.031) | 1/32 (0.031) |
| Over 4 to 8, incl | 1/16 (0.062) | 1/32 (0.031) |
| Over 8 to 18, incl | 3/23 (0.093) | 1/32 (0.031) |
Nominal Wall Thickness:
- Nominal Wall Tolerance Plus 12.5%, Minus 12.5%
- These do not conform to the American National Standard for Welded and Seamless Wrought Steel Pipe
(ANSI B 36.10 – 1979)
NPS Designator |
Outside Diameter in. |
Schedule 10S in. |
Schedule 40S in. |
Schedule 80S in. |
Schedule 160 in. |
Schedule XX in. |
|---|---|---|---|---|---|---|
| 1/4 | 0.540 | 0.065 | 0.088 | 0.119 | ||
| 3/8 | 0.675 | 0.065 | 0.091 | 0.126 | ||
| 1/2 | 0.840 | 0.083 | 0.109 | 0.147 | .188 | .294 |
| 3/4 | 1.050 | 0.083 | 0.113 | 0.154 | .218 | .308 |
| 1.0 | 1.315 | 0.109 | 0.133 | 0.179 | .250 | .358 |
| 1 1/4 | 1.660 | 0.109 | 0.140 | 0.191 | .250 | .382 |
| 1 1/2 | 1.900 | 0.109 | 0.145 | 0.200 | .281 | .400 |
| 2 | 2.375 | 0.109 | 0.154 | 0.218 | .343 | .436 |
| 2 1/2 | 2.875 | 0.120 | 0.203 | 0.276 | .375 | .552 |
| 3 | 3.500 | 0.120 | 0.216 | 0.300 | .438 | .600 |
| 3 1/2 | 4.000 | 0.120 | 0.226 | 0.318 | .636 | |
| 4 | 4.500 | 0.120 | 0.237 | 0.337 | .534 | .674 |
| 5 | 5.563 | 0.134 | 0.258 | 0.375 | .625 | .750 |
| 6 | 6.625 | 0.134 | 0.280 | 0.432 | .719 | .864 |
| 8 | 8.625 | 0.148 | 0.322 | 0.500 | .906 | .875 |
| 10 | 10.750 | 0.165 | 0.365 | 0.500 | 1.125 | |
| 12 | 12.750 | 0.180 | 0.375 | 0.500 | 1.312 | |
| 14 | 14.000 | 0.188 | 0.375 | 0.500 | 1.406 | |
| 16 | 16.000 | 0.188 | 0.375 | 0.500 | 1.594 |
Minimum Wall Thickness on Inspection:
- The following equation, upon which this table is based, may be applied to calculate minimum wall thicknesses from nominal wall thickness:
- tn * 0.875 = tm
Where:
tn = nominal wall thickness, in. [mm], and
tm= minimum wall thicknesses, in. [mm] - The wall thickness is inch-pound units is rounded to three decimal places in accordance with the rounding method of Practice E29. The wall thickness in SI units is rounded to one decimal place in accordance with the rounding method of Practice E29.
- tn * 0.875 = tm
- This table is a master table covering wall thicknesses available in the purchase of different classifications of pipe, but it is not meant to imply that all the walls listed herein are necessarily obtainable for the applicable product specification.
Nominal Thickness |
Minimum Thickness on Inspection |
Nominal Thickness |
Minimum Thickness on Inspection |
Nominal Thickness |
Minimum Thickness on Inspection |
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|---|---|---|---|---|---|---|---|---|---|---|---|
in. |
mm |
in |
mm |
in |
mm |
in |
mm |
in |
mm |
in |
mm |
| 0.068 | 1.7 | 0.060 | 1.5 | 0.294 | 7.5 | 0.257 | 6.5 | 0.750 | 19.0 | 0.658 | 16.6 |
| 0.068 | 2.2 | 0.077 | 2.0 | 0.300 | 7.6 | 0.262 | 6.7 | 0.812 | 20.6 | 0.710 | 18.0 |
| 0.091 | 2.3 | 0.080 | 2.0 | 0.307 | 7.8 | 0.269 | 6.8 | 0.843 | 21.4 | 0.736 | 18.7 |
| 0.095 | 2.4 | 0.083 | 2.1 | 0.308 | 7.8 | 0.270 | 6.9 | 0.854 | 21.7 | 0.756 | 19.2 |
| 0.113 | 2.9 | 0.099 | 2.5 | 0.312 | 7.9 | 0.273 | 6.9 | 0.875 | 22.2 | 0.766 | 19.5 |
| 0.119 | 3.0 | 0.104 | 2.6 | 0.318 | 8.1 | 0.278 | 7.1 | 0.906 | 23.0 | 0.783 | 20.1 |
| 0.125 | 3.2 | 0.109 | 2.8 | 0.322 | 8.2 | 0.282 | 7.2 | 0.937 | 23.8 | 0.820 | 20.8 |
| 0.126 | 3.2 | 0.110 | 2.8 | 0.330 | 8.4 | 0.289 | 7.3 | 0.968 | 24.6 | 0.847 | 21.5 |
| 0.133 | 3.4 | 0.116 | 2.9 | 0.337 | 8.6 | 0.295 | 7.5 | 1.000 | 25.4 | 0.875 | 22.2 |
| 0.140 | 3.6 | 0.122 | 3.1 | 0.343 | 8.7 | 0.300 | 7.6 | 1.031 | 26.2 | 0.902 | 22.9 |
| 0.145 | 3.7 | 0.127 | 3.2 | 0.344 | 8.7 | 0.301 | 7.6 | 1.062 | 27.0 | 0.929 | 23.6 |
| 0.147 | 3.7 | 0.129 | 3.3 | 0.358 | 9.1 | 0.313 | 8.0 | 1.083 | 27.8 | 0.956 | 24.3 |
| 0.154 | 3.9 | 0.135 | 3.4 | 0.365 | 9.3 | 0.319 | 8.1 | 1.125 | 28.6 | 0.984 | 25.0 |
| 0.156 | 4.0 | 0.136 | 3.5 | 0.375 | 9.5 | 0.328 | 8.3 | 1.156 | 29.4 | 1.012 | 25.7 |
| 0.179 | 4.5 | 0.157 | 4.0 | 0.382 | 9.7 | 0.334 | 8.5 | 1.218 | 30.9 | 1.066 | 27.1 |
| 0.187 | 43.7 | 0.164 | 4.2 | 0.400 | 10.2 | 0.350 | 8.9 | 1.250 | 31.8 | 1.094 | 27.8 |
| 0.188 | 4.8 | 0.164 | 4.2 | 0.406 | 10.3 | 0.355 | 9.0 | 1.281 | 32.5 | 1.121 | 28.5 |
| 0.191 | 4.9 | 0.167 | 4.2 | 0.432 | 10.4 | 0.378 | 9.6 | 1.312 | 33.3 | 1.148 | 29.2 |
| 0.200 | 5.1 | 0.175 | 4.4 | 0.436 | 11.1 | 0.382 | 9.7 | 1.343 | 34.1 | 1.175 | 29.8 |
| 0.203 | 5.2 | 0.178 | 4.5 | 0.437 | 11.1 | 0.382 | 9.7 | 1.375 | 34.9 | 1.203 | 30.6 |
| 0.216 | 5.5 | 0.189 | 4.8 | 0.438 | 11.1 | 0.383 | 9.7 | 1.406 | 35.7 | 1.230 | 31.2 |
| 0.218 | 5.5 | 0.191 | 4.9 | 0.500 | 12.7 | 0.438 | 11.1 | 1.436 | 36.5 | 1.258 | 32.0 |
| 0.219 | 5.6 | 0.192 | 4.9 | 0.531 | 13.5 | 0.465 | 11.8 | 1.500 | 36.1 | 1.312 | 33.3 |
| 0.226 | 5.7 | 0.196 | 5.0 | 0.552 | 14.0 | 0.483 | 12.3 | 1.531 | 38.9 | 1.340 | 34.0 |
| 0.237 | 6.0 | 0.207 | 5.2 | 0.562 | 14.3 | 0.492 | 12.5 | 1.562 | 39.7 | 1.367 | 34.7 |
| 0.250 | 6.4 | 0.219 | 5.6 | 0.593 | 15.1 | 0.519 | 13.2 | 1.593 | 40.5 | 1.394 | 35.4 |
| 0.258 | 6.6 | 0.226 | 5.7 | 0.600 | 15.2 | 0.525 | 13.3 | 1.750 | 44.5 | 1.531 | 38.9 |
| 0.276 | 7.0 | 0.242 | 6.1 | 0.625 | 15.9 | 0.547 | 13.9 | 1.781 | 45.2 | 1.558 | 39.6 |
| 0.277 | 7.0 | 0.242 | 6.1 | 0.656 | 16.6 | 0.573 | 14.6 | 1.812 | 46.0 | 1.586 | 49.3 |
| 0.279 | 7.1 | 0.244 | 6.2 | 0.674 | 17.1 | 0.590 | 15.0 | 1.968 | 50.0 | 1.772 | 43.7 |
| 0.280 | 7.1 | 0.245 | 6.2 | 0.687 | 17.4 | 0.601 | 15.3 | 2.062 | 52.4 | 1.804 | 45.8 |
| 0.281 | 7.1 | 0.246 | 6.2 | 0.719 | 18.3 | 0.629 | 16.0 | 2.343 | 59.5 | 2.050 | 52.1 |
Seamless Stainless Steel Pipe Grade Specifications
Stainless Steel Seamless Pipe Specifications |
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|---|---|---|
ASTM A312 |
This specification covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service. | |
ASTM A358 |
This specification includes electric-fusion-welded austenitic chromium-nickel stainless steel pipe. | |
ASTM A813 |
This specification covers two classes of fit-up and alignment quality straight-seam single- or double-welded austenitic steel pipe intended for high-temperature and general corrosive service. | |
ASTM A814 |
This specification covers two classes of flanged and cold-bending quality cold-worked straight-seam single or double welded austenitic steel pipe intended for high-temperature and general corrosive services. | |
Lengths: 17′ – 24′ Random Lengths
