|
Cr |
Ni |
C |
Si |
Mn |
P |
S |
N |
Ce |
Fe |
|
20.00-22.00 |
10.00-12.00 |
0.05-0.10 |
1.40-2.00 |
≤0.08 |
≤0.04 |
≤0.03 |
0.14-0.20 |
0.03-0.08 |
Balance |
Chemical Composition
Mechanical Properties
|
Grade |
Tensile Strength ksi(MPa) |
Yield Strength ksi(MPa) |
Elongation in 2", % |
Hardness Brinell |
Hardness Rockwell |
|
253MA |
≥87(600) |
≥45(310) |
≥40 |
≤217HBW |
≤95HRB |
The ASTMA312 Size Tolerance
|
Standard |
Outside Diameter |
Thickness |
Length |
||||
|
ASTM A312 |
|
O.D. ≦ |
48.26mm |
+0.40mm, |
-0.80mm |
Nominal Thickness ±12.5% |
0mm to +6mm |
|
48.26mm < |
O.D. ≦ |
114.3mm |
±0.80mm, |
|
|||
|
114.3mm < |
O.D. ≦ |
219.08mm |
+1.60mm, |
-0.80mm |
|||
|
219.08mm < |
O.D. ≦ |
457.2mm |
+2.40mm, |
-0.80mm |
|||
|
457.2mm < |
O.D. ≦ |
660.4mm |
+3.20mm, |
-0.80mm |
|||
|
660.4mm < |
O.D. ≦ |
836.6mm |
+4.00mm, |
-0.80mm |
|||
|
863.6mm < |
O.D. |
|
+4.80mm, |
-0.80mm |
|||
Application
- Pyrolysis Vessels
- Boiler Nozzles
- Corrugated Boxes
- Cyclones
- Bar Baskets
- Radiant Tubes
- Combustion chambers
Testing
- EN 10204/3.1B, EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% Radiography Test Report
- 100% PMI
- Heat Treatment Charts
- Third Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate( Impact Testing, Flatten, Spin,Curve, Hardness, Intergranular ,Point corrosions, Grain size, ET,UT, HT...)
- Laboratory Test Certificate from Govt. Approved Lab
- ......
End of Pipe and Tube
- BE : Beveled end
- BBE : Bevel both ends
- BLE : Bevel large end
- BSE : Bevel small end
- TOE / POE = Treaded One End / Plain One End
- TOE / BOE = Treaded One End / Beveled One End
- POE / BOE = Plain One End / Beveled One End
- TBE = Treaded Both Ends
- PBE = Plain Both Ends
Packing
- Ply Wooden Boxes
- PE Fabric Bundles
- Standard seaworthy export packing
- Plastic Bags, or as required
Marking
- Supplier / Manufacturer Name or Custom Logo - on request
- Specification
- Material Grade
- Nominal Size
- Schedule or Wall Thickness
- Method of Manufacturing (Seamless or Welded)
- Heat Number
Marked Pipe Sample: XTD ASTM A312 UNS S30815 SEAMLESS 42.2x 3.56*6000MM HEAT NO. 2023121205A15
Material Summary
Despite its lean nickel content, 253MA offers an outstanding combination of creep strength and high resistance to oxidation, sulphidation and erosion/abrasion at extremely high temperatures. This makes the alloy more economical than most heat resistant alloys.
The high heat resistant properties of 253MA are obtained by the tight control of micro alloy additions. Whilst the benefit of creep rupture strength is down to the combination of nitrogen, carbon and cerium, its superior oxidation resistance is a result of the combination of cerium and silicon.
Its strength at these temperatures is higher than that of alternatives such as Grade 310.
