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ASTM B444 Gr.625 Seamless Nickel Alloy Steel Pipe Annealed Inconel 625 Tube
Alloy 625 nickel pipe is made from a nickel-chromium-molybdenum alloy with an addition of niobium. High strength and toughness from cryogenic temperatures to 1800°F. Good oxidation resistance, exceptional fatigue strength, and good resistance to many corrosives.
Typical applications include chemical processing, aerospace and marine engineering, pollution control equipment, and nuclear reactors.
GRADE
| Standard | Low-Alloy Steel Grade |
| ASTM A335 | P1 P2 P5 P5b P5c P9 P11 P12 P15 P21 P22 P91 P92 |
INCONEL 625 CHEMICAL COMPOSITION
| Element | C | Mn | Si | P | S | Cr | Mo |
| Inconel 625 | 0.10~0.20% | 0.30~0.80% | 0.10~0.50% | 0.025% | 0.025% | - | 0.44~0.65% |
| P12 | 0.05~0.15% | 0.30~0.60% | 0.50% | 0.025% | 0.025% | 0.8~1.25% | 0.44~0.65% |
| P15 | 0.05~0.15% | 0.30~0.60% | 1.15~1.65% | 0.025% | 0.025% | - | 0.44~0.65% |
| P21 | 0.05~0.15% | 0.30~0.60% | 0.50% | 0.025% | 0.025% | 2.65~3.35% | 0.80~1.60% |
| P22 | 0.05~0.15% | 0.30~0.60% | 0.50% | 0.025% | 0.025% | 1.9~2.6% | 0.87~1.13% |
| P91 | 0.08~0.12% | 0.30~0.60% | 0.20~0.50% | 0.02% | 0.01% | 8.0~9.0% | 0.85~1.05% |
| P92 | 0.07~0.13% | 0.30~0.60% | 0.50% | 0.02% | 0.01% | 8.5~9.5% | 0.30~0.60% |
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.
