Description

AS A335 P11 pipes consist primarily of iron, carbon, and other alloying elements such as chromium, manganese and silicon. Carbon content typically ranges from 0.05 to 0.30%, depending on the steel grade; higher carbon content makes the pipe harder and stronger. Chromium content is generally between 0.9-1.5%, which makes the steel corrosion-resistant in many harsh environments. Silicon is usually added in an amount ranging from 0.50-0.80% to increase shock resistance and improve weldability; it also helps reduce carbon migration during welding and toughens up the material structure. Manganese’s role is to allow p11 alloy pipe to keep high strength under low service temperatures by avoiding too much precipitation of ferrite during the transformation into austenite grains when heat treated at high temperatures, which ultimately makes them more durable when used across a wide range of extreme conditions.

ASTM A335 P11 Alloy Steel Pipe are highly regarded in industries using high-pressure application processes. Its properties are optimized for heavy use in many industrial sectors like oil and gas, petrochemical, automotive and other engineering plants. It is tempered and quenched ferritic alloy steel with moderate strength featuring good formability and weldability. This chromium-molybdenum-based alloy also demonstrates exceptional corrosion resistance qualities, enabling it to function as an inexpensive material even in harsh environments. Additionally, its efficient fatigue performance increases the lifetime of A335 P11 pipes, reducing the need for replacement.

ASTM A335 P11 Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service.

ASTM A335 P11 Seamless Pipe is made up of a carbon steel that has 415MPa minimum tensile strength 205MPa minimum yield strength. The material has high toughness and high wear and tear resistance. Sunny Steel is a leading steel supplier of A335/SA335 grade P11 High Pressure Alloy Steel Seamless Pipe that can be customized to suit the size and shape needs of each of our clients.

ASTM A335 P11 Pipe (ASME SA335 P11) is Chrome Moly Alloy Seamless Pipe that used for high-temperature services, P11 Grade Pipe Chrome content at 1.00% to 1.50%, Moly content 0.44% to 0.65%, Minimum tensile strength 415MPa, minimum yield strength 205Mpa. ASTM A335 P11 pipe is designed with a chemical composition of chromium and molybdenum. The pipes have good resistance to corrosive and oxidative media. ASTM A335 P11 grade has outstanding strength in high as well as low temperature conditions.

The A335 P11 pipe has superior toughness and outstanding wear resistance properties. These pipes have enhanced hardness and tolerances. The A335 P11 material is designed possessing excellent mechanical properties. The pipes have a minimum tensile strength of 415mpa with a minimum yield strength of 205mpa.

The A335 Gr P11 grade can be produced in both hot and cold rolling processes. These pipes are designed in sizes between 1/2” to 24 NB. All P11 pipe suppliers supply pipes in schedules of SCH 40, SCH STD, SCH 80, SCH XS, and SCH 160.

The ASTM A335 Gr P11 grade pipe is generally designed in plain and beveled ends. They are available in double random, single random, and cut lengths. A P11 Pipe manufacturer has pipes available in lengths between 6 to 12 meters.

The steel material shall conform to chemical composition, tensile property, and hardness requirements. Each length of pipe shall be subjected to the hydrostatic test. Also, each pipe shall be examined by a non-destructive examination method in accordance to the required practices.

The different mechanical test requirements for pipes, namely, transverse or longitudinal tension test, flattening test, and hardness or bend test are presented.

Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.

• Outer Dimensions: 19.05mm – 114.3mm
• Wall Thickness: 2.0mm – 14 mm
• Length: max 16000mm

What is the P11 chrome pipe?

The chrome P11 pipe is a strong device that is designed with chromium and molybdenum as its primary constituents. This gives the 1.7335 pipes good corrosion resistance properties in harsh environments. These pipes have good higher temperature strength and hardness at room temperature.

The A335 P11 grade has excellent mechanical strength with an outstanding elastic limit. These devices showcase enhanced resistance to wear and impact in the system. The SA335 P11 material can be shaped in different sizes and resists grain growth, and are less susceptible to embrittlement.

Chemical Composition(%) ASTM A335

ASTM Specification pipe confirming to ASTM A335 shall have the following chemical properties. Tensile and Hardness Requirements The tensile properties of the ASTM A335 pipe shall conform to the requirements as prescribed. Pipe of Grades P91, P92, and P122 shall have a hardness not exceeding 250 HB/265 HV [25 HRC]. For pipe of Grades P91, P92, P122, and P911, Brinell, Vickers, or Rockwell hardness tests shall be made on a specimen from each lot (see Note 7). These pipe bear high resistance to rupture at high temperature and pressures. With hydrogen crack resistance and sulfide stress corrosion cracking chrome moly pipe are highly preferred over Carbon pipe.

Grade	UN	C≤	Mn	P≤	S≤	Si≤	Cr	Mo
P1	K11522	0.10~0.20	0.30~0.80	0.025	0.025	0.10~0.50	–	0.44~0.65
P2	K11547	0.10~0.20	0.30~0.61	0.025	0.025	0.10~0.30	0.50~0.81	0.44~0.65
P5	K41545	0.15	0.30~0.60	0.025	0.025	0.5	4.00~6.00	0.44~0.65
P5b	K51545	0.15	0.30~0.60	0.025	0.025	1.00~2.00	4.00~6.00	0.44~0.65
P5c	K41245	0.12	0.30~0.60	0.025	0.025	0.5	4.00~6.00	0.44~0.65
P9	S50400	0.15	0.30~0.60	0.025	0.025	0.50~1.00	8.00~10.00	0.44~0.65
P11	K11597	0.05~0.15	0.30~0.61	0.025	0.025	0.50~1.00	1.00~1.50	0.44~0.65
P12	K11562	0.05~0.15	0.30~0.60	0.025	0.025	0.5	0.80~1.25	0.44~0.65
P15	K11578	0.05~0.15	0.30~0.60	0.025	0.025	1.15~1.65	–	0.44~0.65
P21	K31545	0.05~0.15	0.30~0.60	0.025	0.025	0.5	2.65~3.35	0.80~1.60
P22	K21590	0.05~0.15	0.30~0.60	0.025	0.025	0.5	1.90~2.60	0.87~1.13
P91	K91560	0.08~0.12	0.30~0.60	0.02	0.01	0.20~0.50	8.00~9.50	0.85~1.05
P92	K92460	0.07~0.13	0.30~0.60	0.02	0.01	0.5	8.50~9.50	0.30~0.60

Chrome Moly Pipes: Werkstoff vs EN vs ASTM

ASTM A335 pipe may be either hot finished or cold drawn with the finishing treatment as required in Grade P2 and P12 – The steel shall be made by coarse- grain melting practice. Specific limits, if any, on grain size or deoxidation practice shall be a matter of agreement between the manufacturer and purchaser.

Werkstoff /DIN	EN	ASTM
1.5415	16Mo3	A335 Grade P1
1.7335	13CrMo4-5	A335 Grade P11, P12
1.738	10CrMo9-10	A335 Grade P22
1.7362	X11CrMo5	A335 Grade P5
		A335 Grade P9
1.4903	X10CrMoVNb9-1	A335 Grade P91

Tensile Requirements

Tensile Strength, min., psi	P-5	P-9	P-11	P-22	P-91
ksi	60	60	60	60	85
MPa	415	415	415	415	585
Yield Strength, min., psi
ksi	30	30	30	30	60
MPa	205	205	205	205	415

Product Analysis At the request of the purchaser, an analysis of two pipe from each lot shall be made by the manufacturer. A lot of ASTM A335 pipe shall consist of the following: NPS Designator Under 2 400 or fraction thereof 2 to 5 200 or fraction thereof 6 and over 100 or fraction thereof.
Note: ASTM A335 P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].

Mechanical properties of ASTM A335

Grade	Tensile strength	Yield strength
P1,P2	380	205
P12	415	220
P23	510	400
P91	585	415
P92,P11	620	440
P122	620	400

A335 is often called chrome moly pipe because of the chemical makeup of Molybdenum (Mo) and Chromium (Cr). Molybdenum increases the strength of steel as well as the elastic limit, resistance to wear, impact qualities, and hardenability. Moly increases the resistance to softening, restrains grain growth and makes chromium steel less susceptible to embrittlement. Moly is the most effective single additive that increases high temperature creep strength.

It also enhances the corrosion resistance of steel, and inhibits pitting. Chromium (or chrome) is the essential constituent of stainless steel. Any steel with 12% or more Chrome is considered stainless. Chrome is virtually irreplaceable in resisting oxidation at elevated temperatures. Chrome raises the tensile, yield, and hardness at room temperatures. The composition chrome moly alloy steel pipe make it ideal for use in power plants, refineries, petro chemical plants, and oil field services where fluids and gases are transported at extremely high temperatures and pressures.

Heat Treatment Requirements

Grade	Heat Treatment Type P5, P9, P11, and P22	Normalizing Temperature Range F [C]	Subcritical Annealing or Tempering Temperature Range F [C]
A335 P5 (b,c)	Full or Isothermal Anneal
	Normalize and Temper	*****	1250 [675]
	Subcritical Anneal (P5c only)	*****	1325 – 1375 [715 - 745]
A335 P9	Full or Isothermal Anneal
	Normalize and Temper	*****	1250 [675]
A335 P11	Full or Isothermal Anneal
	Normalize and Temper	*****	1200 [650]
A335 P22	Full or Isothermal Anneal
	Normalize and Temper	*****	1250 [675]
A335 P91	Normalize and Temper	1900-1975 [1040 - 1080]	1350-1470 [730 - 800]
	Quench and Temper	1900-1975 [1040 - 1080]	1350-1470 [730 - 800]

Material & Manufacture

Pipe may be either hot finished or cold drawn with the finishing heat treatment noted below.

Heat Treatment

• A / N+T
• N+T / Q+T
• N+T

Mechanical Tests Specified

• Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test
• For material heat treated in a batch-type furnace, tests shall be made on 5% of the pipe from each treated lot. For small lots, at least one pipe shall be tested.
• For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5% of the lot, but in no case less than 2 pipe.

Notes for Hardness Test:

• P11 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].

Notes for Bend Test:

• For pipe whose diameter exceeds NPS 25 and whose diameter to wall thickness ratio is 7.0 or less shall be subjected to the bend test instead of the flattening test.
• Other pipe whose diameter equals or exceeds NPS 10 may be given the bend test in place of the flattening test subject to the approval of the purchaser.
• The bend test specimens shall be bent at room temperature through 180 without cracking on the outside of the bent portion.

What is ASTM A335 grade P11 equivalent to?

Also known as 1.25Cr-0.5Mo, the UNS designation of ASTM A335 P11 is K11597. Its ASTM equivalent includes ASTM A369 FP11 as well as ASTM A213 T11. Usually, the pipe shall be furnished with either butt welding(BW) or plain ends(PE).

A335 P11 pipe size tolerance