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ASTM A213 Grade T9 Seamless Alloy Steel Pipe
ASTM A213 is the standard specification for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes. Grade : T2, T5, T5b, T5c, T9, T11, T12, T17, T21, T22, T23, T24, T36, T91, T92, T122, and T911. The tubing sizes and thickness usually furnished to this specification are 1/8″(3.2 mm) in inside diameter to 5″(127 mm) in outside diameter and 0.015″ to 0.500″(0.4-12.7 mm) in minimum or average wall thickness. ASTM A213 tubes of custom-diameter may be furnished, provided such tubes comply with all other requirements of the standard specification.
GRADE
| Standard | Low-Alloy Steel Grade |
| ASTM A213 | T2 T5 T5b T5c T9 T11 T12 T17 T21 T22 T23 T24 T36 T91 T122 T911 |
CHEMICAL COMPOSITION
| Element | C | Mn | Si | P | S | Cr | Mo |
| T2 | 0.10~0.20% | 0.30~0.61% | 0.50~0.81% | 0.025% | 0.025% | 0.50~0.81% | 0.44~0.65% |
| T5 | 0.15% | 0.30~0.60% | 0.50% | 0.025% | 0.025% | 4.0~6.0% | 0.44~0.65% |
| T5b | 0.15% | 0.30~0.60% | 1.00~2.00% | 0.025% | 0.025% | 4.0~6.0% | 0.44~0.65% |
| T5c | 0.12% | 0.30~0.60% | 0.50% | 0.025% | 0.025% | 4.0~6.0% | 0.44~0.65% |
| T9 | 0.15% | 0.30~0.60% | 0.25~1.00% | 0.025% | 0.025% | 8.0~10.0% | 0.90~1.10% |
| T11 | 0.05~0.15% | 0.30~0.60% | 0.50~0.10% | 0.025% | 0.025% | 1.0~1.5% | 0.44~0.65% |
| T12 | 0.05~0.15% | 0.30~0.61% | 0.50% | 0.025% | 0.025% | 0.8~1.25% | 0.44~0.65% |
| T17 | 0.05~0.25% | 0.30~0.61% | 0.15~0.35% | 0.025% | 0.025% | 0.8~1.25% | - |
| T21 | 0.05~0.15% | 0.30~0.60% | 0.50~0.10% | 0.025% | 0.025% | 2.65~3.35% | 0.80~1.06% |
| T22 | 0.05~0.15% | 0.30~0.60% | 0.50% | 0.025% | 0.025% | 1.9~2.6% | 0.87~1.13% |
| T23 | 0.04~0.10% | 0.10~0.60% | 0.50% | 0.03% | 0.010% | 1.9~2.6% | 0.05~0.30% |
| T24 | 0.05~0.10% | 0.30~0.70% | 0.15~0.45% | 0.02% | 0.010% | 2.20~2.60% | 0.09~1.10% |
| T36 | 0.10~0.17% | 0.80~1.20% | 0.25~0.50% | 0.03% | 0.025% | 0.30% | 0.25~0.50% |
| T91 | 0.07~0.14% | 0.30~0.60% | 0.20~0.50% | 0.02% | 0.010% | 8.0~9.5% | 0.85~1.05% |
| T92 | 0.07~0.13% | 0.70% | 0.50% | 0.02% | 0.010% | 8.5~9.5% | 0.30~0.60% |
| T122 | 0.07~0.14% | 0.30~0.60% | 0.50% | 0.02% | 0.010% | 10.0~11.5% | 0.25~0.60% |
| T911 | 0.09~0.13% | 0.30~0.60% | 0.10~0.50% | 0.02% | 0.010% | 8.5~9.5% | 0.09~1.10% |
ALLOYING ELEMENTS
The addition of Molybdenum (“Moly”) increases the strength of the steel and its elastic limit, enhance the steel resistance to wear, its impact qualities, and the hardenability. It also improves the resistance to softening, makes chromium steel less prone to embrittlement and prevents pitting.
Chromium, a key element also for stainless steel alloys, prevents
steel oxidation at elevated temperatures and increases the
resistance of steel to corrosion. It enhances the tensile, yield, and hardness properties of
low-alloy pipes at room temperatures.
Other alloying elements, present in various degrees in pipes of all
grades are:
As mentioned, low-alloy steels have a total amount of alloying elements below 5%; high alloy steel has a higher percentage of these elements.
