What is stainless steel pipe?
Stainless steel pipe is a hollow, long, round steel bar widely used in industrial pipelines and mechanical components in the petroleum, chemical, medical, food, light industry, and instrumentation industries. Furthermore, its light weight while maintaining the same bending and torsional strength makes it widely used in the manufacture of mechanical parts and engineering structures.
Stainless steel pipe classification
Stainless steel pipes are mainly produced in two types: seamless and welded. Seamless pipes include hot-rolled, cold-rolled, cold-drawn, and extruded types, with cold drawing and cold rolling used as secondary processing methods. Welded pipes are divided into straight seam welded and spiral welded types.
Stainless steel pipes are classified by cross-sectional shape into round and special-shaped types. Special-shaped pipes include rectangular, elliptical, hexagonal, and other non-round forms. They are widely used in structural parts and machinery. Compared with round pipes, special-shaped pipes offer greater bending and torsional strength, helping reduce structural weight and save material.
Stainless steel pipes are classified by longitudinal cross-section into uniform and variable types. Variable cross-sectional pipes include tapered, stepped, and periodic shapes.
Application classification: Based on their application, they can be categorized into oil well pipes (casing pipe, tubing, and drill pipe, etc.), line pipes, boiler pipes, mechanical structure pipes, hydraulic prop pipes, gas cylinder pipes, geological pipes, chemical pipes (high-pressure fertilizer pipes, oil cracking pipes), and ship pipes.
Stainless steel pipe and tube sizes and grades
Octal supply range for the stainless steel pipe and tube:
Standards: ASTM A321, ASTM A213, ASTM A269, ASME SB677
Duplex stainless steel pipe standards: ASTM A789/ ASME SA 789. ASTM A790/ ASME SA 790
Material: AISI 304, 304L, 316, 316L
Outer Diameter: 5.8 – 508mm,
Wall Thickness: 0.3 – 50mm
Stainless steel pipe size and weight comparison table
Stainless steel pipe dimensions and weights adhere to international standards such as ASTM A312 and JIS G3459. Core parameters include outer diameter, wall thickness, and theoretical weight. Specifications vary for different cross-sectional shapes (round, square, and rectangular). The following table lists commonly used specifications for industrial and residential applications. Weights are calculated based on 304 stainless steel (density 7.93 g/cm³).
Round Tube Size and Weight Table (Seamless/Welded)
|
Nominal diameter (inches) |
Outside diameter (OD) |
Wall thickness (WT) |
Inner diameter (ID) |
Theoretical weight (kg/m) |
|
1/4" |
13.72mm |
1.65mm |
10.42mm |
0.53 |
|
1/2" |
21.34mm |
2.77mm |
15.80mm |
1.28 |
|
3/4" |
26.67mm |
2.87mm |
20.93mm |
1.70 |
|
1" |
33.40mm |
3.38mm |
26.64mm |
2.53 |
|
1 1/2" |
48.26mm |
3.68mm |
40.90mm |
4.10 |
|
2" |
60.33mm |
3.91mm |
52.51mm |
5.51 |
|
3" |
88.90mm |
5.49mm |
77.92mm |
11.44 |
|
4" |
114.30mm |
6.02mm |
102.26mm |
16.10 |
Square tube size and weight table
|
Cross-sectional dimensions (mm x mm) |
Wall thickness (mm) |
Theoretical weight (kg/m) |
Implementation standards |
Applicable Scenarios |
|
15×15 |
1.0 |
0.45 |
ASTM A554 |
Decorative bracket |
|
25×25 |
1.5 |
1.13 |
ASTM A554 |
Furniture structure |
|
30×30 |
2.0 |
1.81 |
ASTM A554 |
Guardrail frame |
|
50×50 |
2.0 |
3.08 |
JIS G3446 |
Building keel |
|
80×80 |
3.0 |
7.30 |
JIS G3446 |
Mechanical support |
|
100×100 |
4.0 |
12.00 |
JIS G3446 |
Large steel structures |
Weight calculation basis:
Round tube: W = π × (OD - WT) × WT × 7.93 × 10⁻³ (W is weight, OD is outer diameter, WT is wall thickness);
Square/rectangular tube: W = (perimeter - 4 × WT) × WT × 7.93 × 10⁻³ (perimeter is the outer circumference of the cross section).
Meaning of pipe number: Sch 40s represents thin-wall/regular-wall thickness grades. The larger the number, the thicker the wall thickness, which is suitable for high-pressure scenarios.
Length specifications: Regular length of welded pipe is 6m, seamless pipe is 5-7m, and can be customized.
Note: The data in the table are theoretical values. The actual weight may have a deviation of ±3% due to production tolerance. The selection should be based on the pressure level and medium characteristics.
ANSI/ASME B36.19 Stainless steel pipe Dimensions and Weight Chart
