Stainless Steel Pipe Dimensions Explained

Stainless steel pipe is a corrosion-resistant, high-strength tubular product used across chemical, food, medical, petroleum, and construction industries. This guide covers its sizes, grades, weight standards, and industry specifications to help you select the right pipe for your project.

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).

1.1 Tube Size and Weight Table (Seamless/Welded)

1.2 Square Tube Size and Weight Table

2. 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).

Example calculation: For a 4" NPS Sch 40S stainless steel pipe (OD = 114.30mm, WT = 6.02mm):
W = π × (114.30 - 6.02) × 6.02 × 7.93 × 10⁻³
W = π × 108.28 × 6.02 × 7.93 × 10⁻³
W ≈ 16.10 kg/m

This matches the value shown in the Quick Reference table above — for a 6-meter length of pipe, the total weight would be approximately 96.6 kg.

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 customized specifications: Regular length of welded pipe is 6m, seamless pipe is 5-7m, and can be.

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.

2.1 Weight Unit Conversion (kg/m ↔ lb/ft)

For customers working in imperial units, here's the same Quick Reference data converted to lb/ft (1 kg/m = 0.672 lb/ft):

Read full guide: Stainless Steel Pipe Dimensions and Weight Chart

Article source: https://article-realm.com/article/Business/83907-Stainless-Steel-Pipe-Dimensions-Explained.html