product name:
ASTM A214 Carbon Steel For Boilers,Superheaters,Heat-Exchangers, Condensers Electric
Applications: for Boilers,Superheaters,Heat-Exchangers, Condensers
Size range: O.D.:6-76mm W.T.:0.9-19.0mm L: according to customer requirement
Manufacture:
Tubes are made by electric-resistance welding.
Surface Condition:
The finished tubes are free of scale., slight amount of oxidation is not considered as scale
Heat treatment:
After welding, all tubes are heat treated at a temperature of 1200℉(650℃) or higher and following by cooling in air or in a cooling chamber of a controlled atmosphere furnace.
Cold drawn tubes shall be heat treated after the final cold-draw pass at a temperature of 1200℉(650℃) or higher
Test and Inspection:
Hardness Requirement
Mechanical Test
- Flattening Test
- Flange Test
- Reverse Test
- Hydrostatic or Nondestructive Electric Test
Steel Grade and Chemical Compositions:
| C | 0.18 |
| Mn | 0.27 to 0.63 |
| P | ≤0.035 |
| S | ≤0.035 |
Mechanical Properties
Tensile Streghth: min ksi[Mpa] 47[325]
Yield Point: min ksi[Mpa] 26[180]
Elongation: ≥35%
Hardness: ≤72HRB
| Tolerance for OD and WT(SA-450/SA-450M) |
| OD in(mm) | + | - | WT in(mm) | + | - |
| ＜1''(25.4) | 0.10 | 0.10 | ≤1.1/2''(38.1) | 20% | 0 |
| 1''～1.1''(25.4～38.1) | 0.15 | 0.15 | ＞1.1/2''(38.2) | 22% | 0 |
| ＞1.1/2''～＜2''(38.1～50.8 | 0.20 | 0.20 | | | |
| 2''～＜2.1/2''(50.8～63.5) | 0.25 | 0.25 | | | |
| 2.1/2''～＜3''(63.5～76.2) | 0.30 | 0.30 | | | |
| 3''～＜4''(76.2～101.6) | 0.38 | 0.38 | | | |
| 4''～＜7.1/2''(101.6～190.5) | 0.38 | 0.64 | | | |
| ＞7.1/2～9''(190.5～228.6) | 0.38 | 1.14 | | | |
Reference Documents:
ASTM A450/A 450M Sepcification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes
QUALITY CONTROL
1~ Incoming Raw Material Inspection
2~ Raw Material Segregation to avoid steel grade mix-up
3~ Heating and Hammering End for Cold Drawing
4~ Cold Drawing and Cold Rolling, on line inspection
5~ Heat Treatment, +A, +SRA, +LC, +N, Q+T
6~ Straightening-Cutting to specified length-Finished Measuring Inspection
7~ Machanical Testing in own labs with Tensile Strength, Yield Strength, Elongation, Hardness, Impact, Mictrostruture etc
8~ Packing and Stocking.
100% of our steel tubes are dimensionally checked
100% of our steel tubes are visually checked to assure they have a perfect surface condition and no surface defects.
100% eddy current test and ultrosonic test to eliminate longitudinal and transversal defects.
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Electric Resistant Welded Steel Tube Astm A214 Carbon Steel For Boilers Images
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