ASTM A872 UNS J93550 Stainless Steel Pipe

ASTM A872 UNS J93550 Steel Pipe covers centrifugally cast ferritic/austenitic steel pipe intended for general corrosive service.Which are susceptible to embrittlement if used for prolonged periods at elevated temperatures.

Description

ASTM A872 UNS J93550 Stainless Steel Pipe
Standard:ASTM A872/A872M
Standard Specification for Centrifugally Cast Ferritic/Austenitic Stainless Steel Pipe for Corrosive Environments
ASTM A872 UNS J93550 Steel Pipe covers centrifugally cast ferritic/austenitic steel pipe intended for general corrosive service.
ASTM A872 UNS J93550 Steel Pipe are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
Materials and Manufacture
Manufacture:
The pipes are made by the centrifugal casting process.
Machining
The pipes are machined on the inner surface and may be supplied either machined or unmachined in the outer surface.
Heat Treatment
All pipes shall be furnished in the heat-treated condition as shown in Table 1.
TABLE 1 Heat Treatment Requirements
Grade Condition
Temperature,
°F [°C]		 Quenching
UNS J93550 1920–2100 [1050–1150] Water quench or rapid
cooling by other means
Chemical Composition of ASTM A872 UNS J93550 Stainless Steel Pipe
Element Grade
UNS J93550
C 0.030
Mn 2.0
P 0.040
S 0.030
Si 2.0
Ni 5.00–8.00
Cr 23.0–26.0
Mo 2.00–4.00
N 0.08–0.25
Cu 1.00
Co 0.50–1.50
Mechanical Properties of ASTM A872 UNS J93550 Stainless Steel Pipe
Requirement Grade
UNS J93550
Tensile strength, min, ksi [MPa] 90 [620]
Yield strength, min, ksi [MPa] 65 [450]
Elongation in 2 in. or 50 mm, min,% 20
Hardness, max:
Brinell 297
Rockwell C 31.5
Quality
The surface of the casting shall be examined visually and shall be free of cracks and hot tears.
Permissible Variations in Dimensions
Thickness—The wall thickness shall not vary over that specified by more than 1 ⁄ 8 in. [3 mm]. There shall be no variation under the specified wall thickness.