• Qingdao Teste 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.
  • Qingdao Teste 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!
  • Qingdao Teste Metal Products Co., Ltd.
    I am very satisfied with this import. The quality is very good and the price is reasonable. The seller is very professional and responsive. I will definitely buy from this seller again.
Contact Person : Tina
Phone Number : +86 13853272823
Whatsapp : +8613853272823

Carbon Steel Seamless Steel Pipe Api ASTM A355 P5 P5b P5c

Place of Origin Shandong China
Brand Name TESTE
Certification ISO TUV SGS BIS CE
Model Number 20# /16Mn/ 12CrMoV /API 5L /API 5L
Minimum Order Quantity 3Tons
Price USD500~USD860 Per Ton
Packaging Details With iron sheet to pack the steel sheet and pallet .Also make the shipping marks on each bundles.
Delivery Time 5-15days depend on the quantity
Payment Terms L/C, D/A, D/P, T/T, Western Union, MoneyGram,OA
Supply Ability 5000Tons Per Months

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,ASME,API
Type Hot Rolled,Cold Drawn,NPS Pipe End Plain End,Beveled End,Treaded
Product Name Seamless Alloy Steel Pipe Standard ASTM, JIS, DIN, GB
Application Petroleum, Chemical, Machinery, Electric Power, Shipbuilding, Papermaking, Construction Length Customized
Surface Treatment Seamless Technique Hot Rolled, Cold Rolled, Cold Drawn
High Light

carbon steel seamless pipe api ASTM A355 P21


p5 pipe ASTM A355 P21


seamless pipe a335 p5 ASTM A355 P21

Leave a Message
Product Description

ASTM A355 Grade P5/P5b/P5c 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 P5 Pipe comes under the ASTM 335 specification with 1/8NB to 24B sizes. The outer dimensions range from 19.05mm to 114mm. This is a larger diameter pipe specification.



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.