• Jiangsu Changjian Metal Products Co., Ltd.
    The coil was packaged very well and shipped fast.The product fits the descripton. Thinking about purchasing again.Really a great product. I have tried other products and this by far is the best money I have spent.
  • Jiangsu Changjian Metal Products Co., Ltd.
    First time we import a big project from China, excellent for service And really professionnal. My goods have been received, the products are not damaged at all.The quality and workmanship are very good, the materials are also very good, I am very satisfied. recommand them!
Contact Person : Elise
WhatsApp : +8617751672908

Schedule 80 Schedule 40 Seamless Carbon Steel Pipe ASTM A355 Grade P2 Asme

Place of Origin Jiangsu,China
Certification ISO 9001 ,CE
Minimum Order Quantity 1 PCS
Delivery Time 7~10 working days
Payment Terms L/C, T/T, Western Union
Supply Ability 5000 Ton/Tons per Month

Contact me for free samples and coupons.

Whatsapp:0086 18588475571

Wechat: 0086 18588475571

Skype: sales10@aixton.com

If you have any concern, we provide 24-hour online help.

Product Details
Product Name Alloy Steel Pipe Standard ASTM A355,ASTM A450,ASTM A530
Type Hot Rolled,Cold Drawn,NPS Pipe End Plain End,Beveled End,Treaded
High Light

schedule 80 seamless carbon steel pipe


asme seamless pipe ASTM A355 P21


seamless schedule 40 pipe ASTM A355 P21

Leave a Message
Product Description

ASTM A355 Grade P2 Seamless Alloy Steel Pipe 

ALLOY pipe

Alloy pipes are tubular with higher percentages, than standard carbon steel pipes, of alloying elements as Molybdenum (Mo), Chromium (Cr), Nickel, etc. Actually, the ASTM A335 covers “low-alloy” steel pipes, i.e. pipes that have a total amount of alloying elements below 5%. The addition of higher percentages of alloying elements (example Nickel and Chromium) transforms the steel into higher alloys, like stainless steel, duplex, up to super-alloyed materials like Inconel, Hastelloy, Monel, etc.


Alloy steel pipes are used in the energy industry for high temperature and very low-temperature service (cryogenic), or for applications with very high pressures.



Standard Low-Alloy Steel Grade

P1     P2     P5     P5b     P5c     P9     P11     P12     P15     P21

P22   P91   P92




ASTM A335 P2 Pipe has 0.44% molybdenum and 4% chromium. It is a low carbon steel with 0.015% carbon and can be welded without filler materials and at room temperature because of the low carbon content.The minimum yield strength of the products is 205MPa and the minimum tensile strength is 415MPa. The ASTM A335 P2 Chrome Moly Pipe also has manganese, phosphorus, sulfur and silicon in the composition.


The pipes come in 3mm to 12mm wall thickness with 1/8NB to 24NB nominal bore sizes. The products come in different pressure capacities ranging with sch20 through XXS schedules. The A335 Gr P2 Pipe can also be further hardened by heat treatment. It could be treated with full or isothermal annealing. There are round, square, rectangular and hydraulic pipe forms. The Sa335 P2 Pipe can be either cold drawn or cold rolled.


The length of the pipes can be single random, double random and cut to length sizes. There are different pipe ends such as beveled, plain and threaded ends for varying application types. The ASTM A335 P2 Steel Pipe is a type of ferritic alloy pip that can be used for high temperature services such as petroleum industrial pipe lines, heat exchangers, oil and gas transmission pipes.



Element C Mn Si P S Cr Mo
P1 0.10~0.20% 0.30~0.80% 0.10~0.50% 0.025% 0.025% - 0.44~0.65%
P2 0.10~0.20% 0.30~0.61% 0.10~0.30% 0.025% 0.025% 0.50~0.81% 0.44~0.65%
P5 0.15% 0.30~0.60% 0.50% 0.025% 0.025% 4.0~6.0% 0.44~0.65%
P5b 0.15% 0.30~0.60% 1.00~2.00% 0.025% 0.025% 4.0~6.0% 0.44~0.65%
P5c 0.12% 0.30~0.60% 0.50% 0.025% 0.025% 4.0~6.0% 0.44~0.65%
P9 0.15% 0.30~0.60% 0.50~0.10% 0.025% 0.025% 8.0~10.0% 0.44~0.65%
P11 0.05~0.15% 0.30~0.61% 0.50~0.10% 0.025% 0.025% 1.0~1.5% 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%




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:

  • Aluminum: decreases oxygen from steelmaking
  • Boron: used to produce fine grain size and enhance steel hardness
  • Cobalt: used to enhance the steel’s heat and wear-resistance
  • Manganese: gives better steel hardenability
  • Nickel: Enhances toughness, hardenability and impact strength at low temperatures
  • Silicon: decreases oxygen, enhances hardenability and toughness
  • Titanium: prevents precipitation of chromium carbide
  • Tungsten: refines steel grain size and enhance the steel hardness, especially at high temperatures
  • Vanadium: gives steel enhanced fatigue resistance


As mentioned, low-alloy steels have a total amount of alloying elements below 5%; high alloy steel has a higher percentage of these elements.