ASTM A335 P12 Seamless Ferritic Alloy-Steel Pipe
ASTM A192,ASME SA 192 Steel Tubes covers minimum-wall-thickness,seamless carbon steel boiler and superheater tubes for high-pressure service.

Description

ASTM A192,ASME SA 192 High-Pressure Seamless Boiler And Superheater Tubes

Standard:ASTM A192,ASME SA 192
ASTM A192,ASME SA 192 Steel Tubes covers minimum-wall-thickness,seamless carbon steel boiler and superheater tubes for high-pressure service.
ASTM A192 High-Pressure Seamless Carbon Steel Boiler Tubes sizes and thicknesses usually furnished to this specification are 1 ⁄ 2 in. to 7 in. [12.7 to 177.8 mm] outside diameter and 0.085 to 1.000 in. [2.2 to 25.4 mm], inclusive, in minimum wall thickness.

ASTM A192 High-Pressure Seamless Boiler Tubes Quick Details
Manufacture:Seamless process ,Hot-finished or Cold-finished
Wall thickness(WT): 3.2mm——25.4 mm.
Outer diameter (OD): 12.7mm——177.8 mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded

Manufacture
ASTM A192 High-Pressure Seamless Boiler Tubes are made by the seamless process and shall be either hot-finished or cold-finished, as specified.
Marking：The marking indicate whether the tube is hot finished or cold finished.

Heat Treatment
Hot-finished tubes need not be heat treated. Cold-finished tubes shall be heat treated after the final cold-finishing at a temperature of 1200°F [650°C] or higher.

Chemical Composition of ASTM A192,ASME SA 192 Boiler Tubes

Carbon, % 0.06–0.18
Manganese, % 0.27–0.63
Phosphorus, max, % 0.035
Sulfur, max, % 0.035
Silicon, max, % 0.25

Mechanical Properties 

Tensile strength, min, ksi [MPa] 47 [325]
Yield strength, min, ksi [MPa] 26 [180]
Elongation in 2 in. or 50 mm, min, % 35
Brinell Hardness Number (Tubes 0.200 in. [5.1 mm] and over in wall thickness) 137 HBW
Rockwell Hardness Number (Tubes less than 0.200 in.[5.1 mm] in wall thickness) 77 HRBW

Note:Mechanical property requirements do not apply to tubing smaller than 1 ⁄ 8 in. [3.2 mm] inside diameter or 0.015 in.[0.4 mm] thickness.

Dimensional tolerances 
Tolerances of  Wall Thickness

Outside
Diameter,
in. [mm]		 Wall Thickness, %
0.095[2.4] and Under Over 0.095 to 0.150[2.4 to 3.8], incl Over 0.150 to 0.180[3.8 to 4.6], incl Over 0.180,[4.6]
Over Under Over Under Over Under Over Under
Seamless, Hot-Finished Tubes
4 [101.6] and under 40 0 35 0 33 0 28 0
Over4 [101.6] …. …. 35 0 33 0 28 0
Seamless, Cold-Finished Tubes
Over Under
1 1 ⁄ 2 [38.1] and under 20 0
Over 1 1 ⁄ 2 [38.1] 22 0

Tolerances of  Outside Diameter

Outside Diameter,in. [mm] Permissible Variations, in. [mm]
Over Under
Hot-Finished Seamless Tubes
4 [101.6] and under 1 ⁄ 64 [0.4] 1 ⁄ 32 [0.8]
Over 4 to 7 1 ⁄ 2 [101.6 to 190.5], incl 1 ⁄ 64 [0.4] 3 ⁄ 64 [1.2]
Over 7 1 ⁄ 2 to 9 [190.5 to 228.6], incl 1 ⁄ 64 [0.4] 1 ⁄ 16 [1.6]
Cold-Finished Seamless Tubes
Under 1 [25.4] 0.004 [0.1] 0.004 [0.1]
1 to 1 1 ⁄ 2 [25.4 to 38.1], incl 0.006 [0.15] 0.006 [0.15]
Over 1 1 ⁄ 2 to 2 [38.1 to 50.8], excl 0.008 [0.2] 0.008 [0.2]
2 to 2 1 ⁄ 2 [50.8 to 63.5], excl 0.010 [0.25] 0.010 [0.25]
2 1 ⁄ 2 to 3 [63.5 to 76.2], excl 0.012 [0.3] 0.012 [0.3]
3 to 4 [76.2 to 101.6], incl 0.015 [0.38] 0.015 [0.38]
Over 4 to 7 1 ⁄ 2 [101.6 to 190.5], incl 0.015 [0.38] 0.025 [0.64]
Over 7 1 ⁄ 2 to 9 [190.5 to 228.6], incl 0.015 [0.38] 0.045 [1.14]

Tolerances of Length

Method of Manufacture OutsideDiameter,in. [mm] Cut Length,in. [mm]
Over Under
Seamless, hot-finished All sizes 3 ⁄ 16 [5] 0 [0]
Seamless, cold-finished Under 2 [50.8] 1 ⁄ 8 [3] 0 [0]
2 [50.8] and over 3 ⁄ 16 [5] 0 [0]
2 [50.8] and over 3 ⁄ 16 [5] 0 [0]