{"id":28865,"date":"2026-09-04T14:32:02","date_gmt":"2026-09-04T06:32:02","guid":{"rendered":"https:\/\/wanzhisteels.com\/?p=28865"},"modified":"2026-09-07T10:18:50","modified_gmt":"2026-09-07T02:18:50","slug":"stainless-steel-pipe","status":"publish","type":"post","link":"https:\/\/wanzhisteels.com\/uz\/stainless-steel-pipe\/","title":{"rendered":"Stainless Steel Pipe"},"content":{"rendered":"
\n\t\t\tUy<\/a>\n\t\t<\/span>\u00bb<\/span>\n\t\t\tMahsulotlar<\/a>\n\t\t<\/span>\u00bb<\/span>\n\t\t\tStainless steel<\/a>\n\t\t<\/span>\u00bb<\/span>\n\t\t\tStainless Steel Pipe\n\t\t<\/span><\/div><\/div><\/div>\n\n\n\n
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\"Stainless<\/figure>\n<\/div>\n\n\n\n
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Stainless Steel Pipe<\/h1><\/div>\n\n\n\n
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Outer Diameter(OD): 6mm \u2013 1219mm<\/p>\n\n\n\n

Wall thickness (WT): 1.0mm \u2013 60mm<\/p>\n\n\n\n

End Type: Plain end, bevel end<\/p>\n\n\n\n

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Send Inquiry<\/div><\/a><\/div><\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Product Details<\/div><\/a><\/div><\/div>\n\n\n\n
Why choose us<\/div><\/a><\/div><\/div>\n<\/div><\/div>\n\n\n\n
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What Is Stainless Steel Pipe?<\/h2><\/div>\n\n\n\n

A stainless steel pipe is a hollow cylindrical length of steel alloyed with chromium \u2014 at least 10.5% \u2014 so it resists rust and corrosion far better than carbon steel. You see it in process plants, on ships, in food lines, and inside buildings. The chromium forms a thin passive film on the surface. When that film is damaged, it reforms automatically in the presence of oxygen, which is why stainless stays cleaner longer than regular pipe.<\/p>\n\n\n\n

We differentiate pipe from tube by usage more than by shape. Pipe is sized by nominal diameter and schedule \u2014 that is, by what fits standard fittings and valves. Tube is sized by actual outer diameter and wall thickness, and it is the go-to when you are bending, structural, or fitting it into a tight assembly. Both are round. Both come in seamless and welded. Both can be 304, 316, or something more specialized. The difference is in how you buy it and how you join it.<\/p>\n\n\n\n

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\"Bundles
Bundles of stainless steel pipe<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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Stainless steel pipe bundles<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

Pipe Size and Weight Reference<\/h2><\/div>\n\n\n\n

Stainless pipe is sold by nominal bore, schedule, and length. Nominal bore is a label, not the actual diameter. The outside diameter is fixed for a given NPS, and the wall thickness grows with schedule number. That is why a NPS 4 SCH 40 and a NPS 4 SCH 80 have the same OD but very different weights and pressure ratings.<\/p>\n\n\n\n

Below is a quick reference for common sizes in SCH 10s through SCH 160s. The weights are for 304\/316 (density 7.93 g\/cm\u00b3). For 430, knock about 3% off. For duplex 2205, add about 1%.<\/p>\n\n\n\n

NPS (inch)<\/th>OD (mm)<\/th>SCH 10s WT (mm)<\/th>Weight kg\/m<\/th>SCH 40s WT (mm)<\/th>Weight kg\/m<\/th>SCH 80s WT (mm)<\/th>Weight kg\/m<\/th><\/tr><\/thead>
1\/2<\/td>21.3<\/td>1.65<\/td>0.97<\/td>2.77<\/td>1.56<\/td>3.76<\/td>2.09<\/td><\/tr>
3\/4<\/td>26.7<\/td>1.65<\/td>1.26<\/td>2.87<\/td>1.99<\/td>3.91<\/td>2.65<\/td><\/tr>
1<\/td>33.4<\/td>1.91<\/td>1.81<\/td>3.38<\/td>3.10<\/td>4.55<\/td>4.09<\/td><\/tr>
1 1\/2<\/td>48.3<\/td>2.11<\/td>2.88<\/td>3.68<\/td>4.89<\/td>5.08<\/td>6.58<\/td><\/tr>
2<\/td>60.3<\/td>2.11<\/td>3.74<\/td>3.91<\/td>6.62<\/td>5.54<\/td>9.14<\/td><\/tr>
3<\/td>88.9<\/td>2.77<\/td>6.75<\/td>5.49<\/td>12.6<\/td>6.35<\/td>14.3<\/td><\/tr>
4<\/td>114.3<\/td>3.05<\/td>9.63<\/td>6.05<\/td>18.0<\/td>8.05<\/td>23.5<\/td><\/tr>
6<\/td>168.3<\/td>3.40<\/td>15.5<\/td>7.11<\/td>30.5<\/td>10.97<\/td>45.6<\/td><\/tr>
8<\/td>219.1<\/td>4.78<\/td>29.7<\/td>8.18<\/td>48.9<\/td>12.70<\/td>72.7<\/td><\/tr>
10<\/td>273.1<\/td>5.08<\/td>40.0<\/td>9.27<\/td>69.6<\/td>15.09<\/td>108<\/td><\/tr>
12<\/td>323.9<\/td>6.35<\/td>58.5<\/td>11.07<\/td>97.4<\/td>17.48<\/td>149<\/td><\/tr>
18<\/td>457.2<\/td>6.99<\/td>84.7<\/td>13.49<\/td>158<\/td>21.44<\/td>242<\/td><\/tr>
24<\/td>609.6<\/td>8.74<\/td>149<\/td>17.48<\/td>287<\/td>26.19<\/td>417<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

To estimate weight without a table, use this formula for meters per kilogram by dividing the square of the OD in mm by the wall in mm, then multiplying by 0.02466. For a quick yard estimate, a NPS 4 SCH 40 304 pipe runs about 18 kg per meter, and a NPS 8 SCH 40 runs about 49 kg per meter.<\/p>\n\n\n\n

Standards and Certifications<\/h2><\/div>\n\n\n\n

When you order stainless pipe, the standard tells the mill what to check and what tolerances to hold. Mismatched standards are a common source of surprise on site.<\/p>\n\n\n\n

Standard<\/th>Scope<\/th>Typical use<\/th><\/tr><\/thead>
ASTM A312<\/td>Seamless and welded austenitic chromium\u2013nickel stainless steel pipe<\/td>Process, power, chemical, oil & gas<\/td><\/tr>
ASTM A269<\/td>Seamless and welded austenitic stainless steel tubing for general service<\/td>Heat exchangers, condensers, structural<\/td><\/tr>
ASTM A213<\/td>Seamless ferritic and austenitic alloy-steel furnace tubes<\/td>Boilers, heat exchangers, superheaters<\/td><\/tr>
EN 10216-2<\/td>Pressurised purposes \u2014 non-alloy and alloy steel pipes<\/td>European projects, PED compliance<\/td><\/tr>
EN 10217-2<\/td>Welded steel pipes for pressure purposes<\/td>European welded pipe spec<\/td><\/tr>
JIS G3459<\/td>Stainless steel pipes for general structure<\/td>Japanese equipment and plant<\/td><\/tr>
ASME B36.19<\/td>Dimensional table for stainless pipe<\/td>Reference for NPS and SCH sizes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Seamless vs Welded Pipe<\/h2><\/div>\n\n\n\n

This is the decision that affects price and performance the most.<\/p>\n\n\n\n

Feature<\/th>Seamless<\/th>Welded (ERW \/ Austenitic)<\/th><\/tr><\/thead>
How it is made<\/td>Pilger mill or extrusion from a solid billet<\/td>Formed and welded along a longitudinal seam<\/td><\/tr>
Homogeneity<\/td>No seam, uniform cross-section<\/td>Weld zone is a metallurgical difference to manage<\/td><\/tr>
Pressure rating<\/td>Generally higher for a given size and schedule<\/td>Good, but the seam is the weak point under extreme cyclic load<\/td><\/tr>
Surface quality<\/td>Inside can be rougher unless reamed<\/td>Smooth inside and out after finishing<\/td><\/tr>
Size range<\/td>Up to about 323.9 mm OD as standard, larger on request<\/td>Wide range, up to 1219 mm OD and beyond<\/td><\/tr>
Cost<\/td>Higher, because of more processing<\/td>Lower, especially in larger diameters<\/td><\/tr>
Lead time<\/td>Longer for non-stock sizes<\/td>Shorter for standard sizes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Seamless is the default for high pressure, high temperature, and aggressive service. Think hydraulic lines, boiler tubes, and chemical process piping. Welded austenitic pipe is what you see in food, water, architecture, and general plant service where the pressure is moderate and the inside finish matters. If you are unsure, ask us which route fits your pressure, temperature, and fluid. The right choice is rarely the most expensive one.<\/p>\n\n\n\n

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\"Cross
Stainless steel pipe grades<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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Seamless vs Welded pipe<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

Grades We Supply<\/h2><\/div>\n\n\n\n

The grade sets corrosion resistance and strength. Here is what we keep in coil, plate, and pipe form, and where each one belongs.<\/p>\n\n\n\n

Grade<\/th>Type<\/th>Key features<\/th>Best for<\/th>Avoid<\/th><\/tr><\/thead>
304 \/ 304L<\/td>Austenitic<\/td>18% Cr, 8% Ni, low carbon L version<\/td>General process, food, architecture. The default pipe grade.<\/td>Heavy chlorides, marine immersion<\/td><\/tr>
316 \/ 316L<\/td>Austenitic, 2\u20133% Mo<\/td>Molybdenum boosts resistance to chlorides and many acids<\/td>Coastal, chemical, pharma, offshore, desalination<\/td>Warm stagnant seawater (step up to duplex)<\/td><\/tr>
321<\/td>Austenitic, Ti-stabilized<\/td>Titanium prevents intergranular corrosion after welding<\/td>High temperature exhaust, continuous heat up to about 800\u00b0C<\/td>Cold general service where 304L is cheaper<\/td><\/tr>
310S<\/td>Austenitic, high Cr\/Ni<\/td>Excellent heat and oxidation resistance<\/td>Furnace parts, heat exchangers, annealing boxes<\/td>Routine piping (over-spec and pricey)<\/td><\/tr>
2205 (duplex)<\/td>Duplex<\/td>Roughly twice the yield of 304, good chloride resistance<\/td>Oil & gas, chemical, seawater cooling, pulp & paper<\/td>Light-duty indoor use (cost not justified)<\/td><\/tr>
2507 (super duplex)<\/td>Duplex, higher alloy<\/td>Superior stress-corrosion and pitting resistance<\/td>Severe offshore, sour service, high chloride plants<\/td>Non-corrosive service<\/td><\/tr>
904L<\/td>Austenitic, super-austenitic<\/td>Very high alloy for aggressive acids<\/td>Sulfuric, phosphoric, acetic acid service<\/td>General water service<\/td><\/tr>
430<\/td>Ferritic, no nickel<\/td>Magnetic, cheaper, decent atmospheric resistance<\/td>Decorative, dry indoor, exhaust trim<\/td>Wet, food-contact, or exterior marine<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

304L and 316L are the low-carbon versions. The ‘L’ means carbon is capped at 0.03% instead of 0.08%, which reduces the risk of sensitization when you weld. If the pipe will be welded in service or during installation, spec the L grade. If it stays bolted or mechanically joined, regular 304 or 316 is fine.<\/p>\n\n\n\n

Surface Finishes<\/h2><\/div>\n\n\n\n

The finish affects hygiene, pressure drop, and appearance. Inside finish matters most for process and food piping. Outside finish matters for architecture and exposed plant.<\/p>\n\n\n\n