ASTM A135 Grade A/B standards

Contents
erw carbon steel pipe

ASTM A135 is a standard specification for electric-resistance-welded (ERW) steel pipes designed for fire protection systems. These steel tubes are engineered to withstand the rigors of fire suppression, making them an essential part of fire sprinkler systems in residential, commercial, and industrial settings. 

Their robust construction and exceptional performance characteristics have made them a preferred choice for engineers, contractors, and safety experts when it comes to ensuring the safety and integrity of a structure.

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ASTM A135 standard

The ASTM A135 standard outlines the specific requirements for these steel tubes, including their dimensions, mechanical properties, and testing procedures. This ensures that ASTM A135 steel tubes meet the stringent quality and safety standards necessary for fire protection applications.

Dimensions

A comprehensive listing of ASTM A135 standardized pipe dimensions is contained in ASME B36.10M. ASTM A135 is a Standard Specification for Electric-Resistance-Welded Steel Pipe.

It covers two grades of ERW steel pipe in sizes NPS 2 to 30, with nominal (average) wall thickness up to 12.7mm, inclusive, and in nominal sizes NPS 3/4 to 5 with a nominal (average) wall thickness of 2.11mm to 3.40mm, depending on size.

This specification covers electric-resistance-welded pipes that are suitable for flanging, bending, and other similar forming operations, and for welding. The electrical resistance of the weld is calculated by dividing the arc length by the cross-sectional area. 

ASTM A135 Grade A/B standards

Mechanical Properties

Tensile Strength and Yield Strength: 30-35

ASTM A135 imposes specific requirements on the mechanical properties of the steel tubes. The standard outlines minimum values for tensile strength and yield strength. 

These requirements guarantee that the tubes possess the necessary structural integrity to withstand the demands of fire protection applications. Tensile strength is the maximum stress a material can endure while being stretched, while yield strength indicates the stress at which the material begins to deform plastically.

Elongation and Flattening: ASTM A135 also governs the elongation and flattening characteristics of the steel tubes. These properties are crucial for ensuring the tubes can endure bending, shaping, and installation without compromising their structural integrity. The standard prescribes the minimum elongation percentage and specific flattening tests to verify the material’s ductility and suitability for its intended use.

astm a795

Mechanical Properties

Tensile Strength and Yield Strength: 35-30

ASTM A135 fire pipe imposes specific requirements on the mechanical properties of the steel tubes. The standard outlines minimum values for tensile strength and yield strength. These requirements guarantee that the tubes possess the necessary structural integrity to withstand the demands of fire protection applications. Tensile strength is the maximum stress a material can endure while being stretched, while yield strength indicates the stress at which the material begins to deform plastically.

Elongation and Flattening: ASTM A135 also governs the elongation and flattening characteristics of the steel tubes. These properties are crucial for ensuring the tubes can endure bending, shaping, and installation without compromising their structural integrity. The standard prescribes the minimum elongation percentage and specific flattening tests to verify the material’s ductility and suitability for its intended use.

ASTM A135 Grade A Grade B
Tensile Strength, 48 60
min, ksi [MPa] [330] [415]
Yield Strength, 30 35
min, ksi [MPa] [205] [240]
Elongation, 35 30
min, %

For more detailed data tables, click here.

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