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GB13296 -1991 High Pressure Precision Steel Tube For Boiler Heat Exchangers
Seamless Stainless Steel tubes For Boiler and Heat Exchanger, are made according to the Chinese National Standard GB13296-91.
GB13296-91 is a standard applicable for Seamless Stainless Steel pipes which is used for boiler and heat exchanger.
GB13296-1991 Seamless Stainless Steel Tubes for Boiler, Heat Exchangers
0Cr18Ni9 1Cr18Ni9Ti 0Cr18Ni12Mo2Ti
Technical tandard: GB13296-91
Tolerance for seamless stainless boiler tube:
| Production Method | Size(mm) | Tolerance | |
| Hot Rolling(Extrusion) | OD | ≤140 | ±1.25% |
| ＞140 | ±1.0% | ||
| WT | ≤10 | ±12.5% | |
| ＞10 | ±15% | ||
| Cold Drawn(Cold Rolled) | OD | 8~30 | ±0.20mm |
| ＞30~50 | ±0.30mm | ||
| ＞50 | ±0.8% | ||
| WT | 1.0~3 | +12% -10% | |
| ＞3.0 | ±10% | ||
Length:
The length or general steel tube:
Hot Rolling(Extrusion) tube: 3~12 m
Cold Drawn(Cold Rolled) tube: 3~8 m
The length for water pipe & boiler steel pipe:
Hot Rolling(Extrusion) tube: 4~12 m
Cold Drawn(Cold Rolled) tube: 4~8 m
Bending tolerance:
WT≤15mm, Bending≤1.5mm/m
WT＞15mm, Bending≤2.0mm/m
End shape:
Both ends of the pipe should be cut at right angles, and remove burrs
Mechanical property
Heat treatment of longitudinal mechanical properties of steel pipe shall according to the standard.
| Material | Tensile strength MPa ≥ | Yield Strength MPa ≥ | Elongation % ≥ |
| 0Cr18Ni9 | 520 | 205 | 35 |
| 1Cr19Ni9 | 520 | 205 | 35 |
| 0Cr19Ni10 | 480 | 175 | 35 |
| 1Cr18Ni9Ti | 550 | 205 | 40 |
| 0Cr18Ni12Mo2Ti | 530 | 205 | 35 |
| 0Cr26Ni5Mo2 | 590 | 390 | 18 |
| 1Cr17 | 410 | 245 | 20 |
| 00Cr27Mo | 410 | 245 | 20 |
| 1Cr25Ti | 440 | 245 | 17 |
Hardness:
For the tubes which W.T. ≥2 mm, Rockwell hardness tests should be taken.
Tests of the seamless boiler tubes:
1.Bending Test:
The tubes should take the bending test when OD ≤22mm. The bending angle is 90 degrees, and the bending radius is 6 times the outer diameter of the steel tube.
2. Hydraulic test;
Eddy current testing, ultrasonic testing can be used instead of hydraulic tests. When eddy current testing, GB/T 7735-1995 Gr. A should be followed; when ultrasonic testing, GB/T 5777-1996 Gr. C8 should be followed.
3. Flattening test
4. Flanging test
5. Expand test
