ASTM A192 High Pressure seamless carbon steel boiler tube

The ASTM A192 specification specifies minimum wall thickness standards for seamless carbon steel tubes for high pressure boilers and superheaters, which are ideal for use in high, medium and low pressure environments.

Chemical composition:

Carbon: 0.06%-0.18%
Manganese: 0.27%-0.63%
Silicon: ≤0.25%
Phosphorus: ≤0.0035%
Sulfur: ≤0.0035%

Mechanical properties:

Tensile strength: ≥325MPa
Yield strength: ≥180MPa
Elongation: ≥35
Hardness (HB, wall thickness ≥5.1mm) : ≤137
Hardness (HB, wall thickness <5.1mm) : ≤77

Size range: Outer diameter (O.D.) :6.0mm-114.0mm, wall thickness (W.T.) : 1mm-15mm, length: up to 12000mm.

Dimensional tolerance

Outside diameter tolerance

Production Method	Diameter Range (mm)	Tolerance (mm)
Hot Rolled	OD ≤ 101.6	-0.5
	101.6 < OD ≤ 177.8	-0.33
Cold Drawn	OD < 25.4	±0.10
	25.4 ≤ OD ≤ 38.1	±0.15
	38.1 < OD < 50.8	±0.20
	50.8 ≤ OD < 63.5	±0.25
	63.5 ≤ OD < 76.2	±0.30
	76.2 ≤ OD ≤ 101.6	±0.38
	101.6 < OD ≤ 177.8	-0.59

Wall thickness tolerance

Production Method	OD Range (mm)	WT Range (mm)	Tolerance (%)
Hot Rolled	OD ≤ 101.6	WT ≤ 2.4	+40 / -0
		2.4 < WT ≤ 3.8	+35 / -0
		3.8 < WT ≤ 4.6	+33 / -0
		WT > 4.6	+28 / -0
	OD > 101.6	2.4 < WT ≤ 3.8	+35 / -0
		3.8 < WT ≤ 4.6	+33 / -0
		WT > 4.6	+28 / -0
Cold Drawn	OD ≤ 38.1		+20 / -0
	OD > 38.1		+22 / -0

Test requirement

Mechanical property test

Flattening test
Flaring test
Flanging test
Hardness test

Hydraulic or non-destructive electrical testing: To ensure the integrity of the pipe under pressure.

Application field
ASTM A192 piping is mainly used for:

High pressure boiler
Superheater system
Power plant heat exchanger