B36.10 VS B36.19 Difference Between ASME B36.10 and ASME B36.19M

ASME B36.10: Covers welded and seamless wrought steel pipe, including carbon steel, alloy steel, and ferritic stainless steel.

ASME B36.19M: Covers welded and seamless wrought stainless steel pipe, specifically austenitic stainless steel .

Schedule Designations

ASME B36.10: Uses a wide range of schedule numbers including 5, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, as well as the legacy designations STD (Standard), XS (Extra Strong), and XXS (Double Extra Strong) .
ASME B36.19M: Uses schedules with an “S” suffix to differentiate them from B36.10, specifically 5S, 10S, 40S, and 80S .

Both Standards: Share the identical outside diameter (OD) table for the same Nominal Pipe Size (NPS). This ensures compatibility with flanges, fittings, and valves regardless of which standard is used .

While the ODs are the same, wall thicknesses can differ, particularly for specific sizes and schedules:

For NPS 12 and above, Schedule 40S (B36.19M) has a different wall thickness than Schedule 40 (B36.10). For example, at NPS 14, B36.19M specifies 9.53 mm while B36.10 specifies 11.13 mm .
The official standard notes specific wall thickness differences for Schedule 10S (NPS 14 through 22), Schedule 40S (NPS 12), and Schedule 80S (NPS 10 and 12) compared to the equivalent schedules in B36.10 .

B36.19M is referenced by stainless steel pipe specifications such as ASTM A312

B36.10 is referenced by material specifications for carbon/alloy steel pipes such as ASTM A106, A53, A335, and API 5L .

Item	ASME B36.10M	ASME B36.19M
Full Name	Welded and Seamless Wrought Steel Pipe	Stainless Steel Pipe
Main Material Scope	Carbon steel, alloy steel, low-alloy steel	Wrought austenitic stainless steel (e.g., 304, 316)
Pipe Dimensions	Outer diameter (OD) consistent with nominal pipe size (NPS)	Same outer diameter (OD) for the same NPS
Wall Thickness Designation	Standard schedules: Sch 5, 10, 20, 30, 40, 80, 120, 160;STD, XS, XXS	Suffix “S” schedules: Sch 5S, 10S, 40S, 80S
Wall Thickness	Relatively thicker, for high-pressure and high-temperature service	Generally thinner wall thickness, optimized for stainless steel
Typical Applications	General industry, oil & gas, power plants, water systems	Corrosive environments, chemical, food, pharmaceutical, hygienic systems
Unit System	Inch‑based (US customary)	Metric‑inch hybrid (metric dimensions with NPS)