Metal Tubular Products The pipe must be suitable for fusion welding and for bending, flanging, and other equivalent forming operations according to ASTM A335 P12. The chemical composition, tensile properties, and hardness standards for the steel material must be met.
A335 Pipe is a seamless ferritic alloy steel pipe designed for high temperature service (ASME S/A335, Chorme-Moly). Pipe ordered in accordance with this standard must be capable of fusion welding as well as bending, flanging (vanstoning), and other equivalent forming operations. Chome moly pipe is common in P-Grades P5, P9, P11, P12, P22, and P91, which are also referred to as "P Grade" on occasion. Grades P11, P22, and P91 are most frequently used in the petrochemical industry and power generation, whereas Grades P5 and P9 are frequently utilized in refineries. Due to the chemical composition of molybdenum (Mo) and chromium (Cr), A335 is frequently referred to as chrome moly pipe. Steel's strength, elastic limit, wear resistance, impact properties, and hardenability are all improved by molybdenum.
Moly makes chromium steel less prone to embrittlement, slows down grain growth, and increases resistance to softening. The best addition for boosting high temperature creep strength is molybdenum. Additionally, it prevents pitting and strengthens the steel's resistance to corrosion. The primary component of stainless steel is chromium, sometimes known as chrome. Stainless steel is any steel that contains at least 12% chrome. Chrome is essentially unique in its ability to withstand oxidation at high temperatures. At room temperature, chrome increases tensile, yield, and hardness. For usage in power plants, refineries, petrochemical facilities, and oil field services where fluids and gases are delivered at extremely high temperatures and pressures, chrome moly alloy steel pipe is the perfect choice.
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Specification:
/8 to 2 1/2 [6 to 65] incl., all t/D ratios
Above 2 1/2 [65], t/D < or = 5%
Above 2 1/2 [65], t/D > 5%
Chemical Composition of A335 P12 Alloy Steel Seamless Pipe
| C, % | Mn, % | P, % | S, % | Si, % | Cr, % | Mo, % |
| 0.015 max | 0.30-0.61 | 0.025 max | 0.025 max | 0.50 max | 0.80-1.25 | 0.44-0.65 |
Mechanical Properties of A335 P12 Alloy Steel Seamless Pipe
| Tensile Strength, MPa | Yield Strength, MPa | Elongation, % |
| 415 min | 205 min | 30 min |
Advantages of A335 P12 Alloy Steel Seamless Pipe:
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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Applications Industry
| Pharmaceutical Equipment | Chemical Equipment |
| Sea Water Equipment | Heat Exchangers |
| Heat Exchangers | Gas Processing |
| Condensers | Specialty Chemicals |
| Pulp and Paper Industry | Pharmaceuticals |
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