ASTM B444 UNS NO6625 Alloy Seamless Tubes for Boiler Calderas
YUHONG Group offers ASTM B444 UNS NO6625 SMLS alloy steel tubes and we sell these tubes in more than 70 countries up to now. This specification covers nickel-chromiummolybdenum-columbium alloys (UNS N06625 and UNS N06852) and nickel-chromium-molybdenum-silicon alloy (UNS N06219) in the form of cold-worked seamless pipe and tube.
UNS N06625 products are furnished in two grades of different heat-treated conditions:
Grade 1 (annealed)—Material is normally employed in service temperatures up to 1100°F (593°C).
Grade 2 (solution annealed)—Material is normally employed in service temperatures above 1100°F (593°C) when resistance to creep and rupture is required.
(Note 1:Hot-working or reannealing may change properties significantly, depending on working history and temperatures.)
Specifications
| Standard/Grade | ASTM B444 UNS NO6625 |
| Name of Material | Stainless Steel Tubes----Seamless |
| Keywordas | Alloy steel; SMLS steel tube;boiler / condenser tube;etc. |
| Size and Thickness | OD:0.25"-24" W.T:0.02"-2.5" |
| Condition | Annealed / Solution annealed |
| Quantity | Feet,metres,or number of lengths |
| Length | Length Max: 50ft |
Test Required
Chemical Analysis/ Mechanical Properties/ Hardness Test/ Flattening Test/ Tension Test/ FlaringTest
Intergranular Corrosion Test/ Hydrostatic or Nondestructive Electric Test/ Grain Size
Chemical Composition % UNS NO6625
| C | Mn | P | SI | S | Cr | Cb+Ta |
| 0.1max | 0.5max | 0.015max | 0.5max | 0.015max | 20-23 | 3.15-4.15 |
| Co | Mo | Fe | Al | Ti | Ni | / |
| 1max | 8-10 | 5max | 0.4max | 0.4max | 58min | / |
Tensile Requirements
| Grade | Tensile Strength(Mpa) min | Yield Strength (Mpa) min | Elongation (%) |
| UNS NO6625 Gr 1 (annealed)D | 827 | 414 | 30 min |
| UNS NO6625 Gr 2 (solution annealed)E | 690 | 276 | 30 min |
*Note: Not applicable to outside diameters under 1⁄8 in. (3.2 mm) and to wall thicknesses under 0.015 in. (0.38 mm). B Hot forming quality pipe and tubing is furnished to chemical requirements and surface inspection only. No tensile properties are required.
D: Annealed at 1600°F (871°C) minimum.
E: Solution annealed at 2000°F (1093°C) minimum, with or without subsequent stabilization anneal at 1800°F (982°C) minimum to increase resistance to sensitization.
Applications Industries
Sea Water Equipment
Food Processing
Pulp and Paper Industry
Condensers & Boiler & Heat Exchangers
Oil Waste Gas Combustion Pipeline
Petrochemicals- Oil Refining Chemical,etc.
Energy Field- Nuclear Power Generation,Tidal Power Generation,etc
Environmental Protection Field- Gas Processing,Waste Water Treatment,etc.
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ASTM B444 UNS NO6625 Alloy Seamless Tubes for Boiler Calderas Images
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