ASTM A192 is a standard specification issued by the American Society for Testing and Materials (ASTM) titled "Standard Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure Service." Below is a detailed introduction to this standard:
1. Scope of Application:
Applies to seamless carbon steel boiler and superheater tubes with minimum wall thickness for high-pressure applications.
Typically available in outer diameters from ½ inch to 7 inches (12.7 mm to 177.8 mm) and minimum wall thickness from 0.085 inch to 1.000 inch (2.2 mm to 25.4 mm). Other sizes may be provided if all other requirements of this standard are met. However, mechanical property requirements do not apply to tubes with an inner diameter less than ⅛ inch (3.2 mm) or thickness less than 0.015 inch (0.4 mm).
2. Manufacturing Process:
Tubes must be manufactured using seamless processes and undergo appropriate heat treatment to meet standard requirements.
3. Surface Treatment & Protection:
Depending on requirements, tubes may undergo surface treatments such as painting, oiling, or hot-dip galvanizing to enhance corrosion resistance and service life.
4. Product Identification & Quality Control:
Tubes must be marked with standard number, grade, dimensions, and production information for traceability and quality control.
Strict quality inspections must be conducted throughout production, including raw material inspection, in-process inspection, and final product inspection, to ensure compliance with ASTM A192 requirements.
Specification
Outside Diameter: 12.7-177.8mm
Wall Thickness: 2.2-25.4mm
Length: 6-32m
Type: Straight Tube, U-Bend Tube
ASTM A192 High-Pressure Carbon Steel Boiler Tube Chemical Composition:
|
Grade |
Chemical composition(%) |
|||||
|
C |
Type |
C |
Si |
Mn |
P | S |
|
ASTM A192 |
S=Seamless |
0.06~0.18 |
0.25Max |
0.27~0.63 |
0.035Max |
0.035Max |
A192 Boiler Tube Mechanical Property:
|
Grade |
Elongation % |
Tensile Test MPa or N/mm2 |
|
|
A |
Min Yield Strength |
Tensile Strength | |
|
ASTM A192 |
=35 |
=180 |
=325 |
ASTM A192 steel tube for Boiler Hardness Requirement:
|
Brinell Hardness Number |
Rockwell Hardness Number |
|
(Tubes 0.200 in. [5.1 mm] and over in wall thickness) |
(Tubes less than 0.200 in. [5.1 mm] in wall thickness) |
|
137 HB |
77 HRB |
Test
Non-destructive Testing (NDT): Typically performed using ultrasonic or eddy current testing to detect internal and surface defects such as cracks or inclusions in the steel tube walls.
Physical and Chemical Testing: Samples are taken from the entire batch of tubes and subjected to laboratory tests including tensile testing, hardness testing, flattening testing, and flaring testing to verify mechanical and processing properties.
Hydrostatic Testing: Each tube undergoes a hydrostatic test at specified pressure to assess its pressure-bearing capacity and sealing integrity.
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