Chrome Moly Pipe

ASTM A335 Pipe (ASME S/A335, Chorme-Moly) is a seamless ferritic Alloy-Steel Pipe for high temperature service. Pipe ordered to this specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding. Sometimes referred to as “P Grade”, chome moly pipe is popular in P-Grades P5, P9, P11, P22, and P91.

Main ASTM A335 alloy pipes/tubes

General Abbreviations of chrome moly pipe are chrome-moly, cro-moly, CrMo, CRMO, CR-MOLY.

ASTM A335 P9 alloy pipe

The range of ASTM A335 P9 seamless alloy steel pipe sizes that may be examined by each method shall be subjected...

ASTM A335 P11 alloy pipe 

ASTM A335 P11 is the part of ASTM A335, the pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding.

A335 P22 alloy pipe 

ASTM A335 P22 is the part of ASTM A335, the pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding.

A335 P91 alloy pipe 

ASTM A335 P91 is the part of ASTM A335, the pipe shall be suitable for bending, flanging...

ASTM A335 P92 alloy pipes

ASTM A335 P92 pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding.

A335 P5 High pressure pipes

The range of ASTM A335 P5 pipe sizes that may be examined by each method shall be subjected to...

ASTM A335 standard is issued under the fixed designation A 335/A 335M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

The most common use of grades P11, P22, and P91 is in the power industry and petro-chemical plants, Grades P5 and P9 are commonly used in refineries.

Sunny Steel Supply stocks a full range of the following A335 pipe grades:

Grades: ASTM A335 P5, P9, P11, P-22, and P91 

Sizes 

• NPS 1/4'' to NPS 24'' 
• Wall Thickness - Schedules 40 through 160, STD, XS, XXS. 
• Unscheduled heavy wall pipe thicknesses available up to 4 inches. 

ASTM A335 is often called as chrome moly pipe because of the chemical contain of Molybdenum (Mo) and Chromium (Cr). Molybdenum increases the strength of steel and Chromium (or chrome) is the essential constituent of stainless steel.

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.

Applications:

Chrome moly pipe under ASTM & ASME specification A/SA 335 P1, P2, P11, P12, P15, P22, P91, P92, P122 are used for power industries whereas ASTM/ASME A/SA 335 P5, P9 are used for petrochemical industries

• Strong resistance to rupturing at high temperatures and high pressures
• May be used for Hydrogen Sulfide Corrosion Services
• Resistant to cracking from hydrogen attack and embrittlement
• Resistant to hot sulfide corrosion cracking
• Can be used for NACE Applications where sour environments are under high temp and pressure
• Can be used in NACE-MRO 175 Sour Service
• Ideal for creep rupture applications
• Can handle high temperatures with very low elasticity

Certitifcation: Chrome Moly pipe are certified as PER DIN 50049 3.1, EN 10204 3.1/3.2 and NACE MR-0175 & NACE MR-0103

Piping Component Specifications:

• Flanges and forged fittings – A/SA 182 F1, F2, F5, F9, F11, F12, F15, F22, F91, F92, F122 Wrought
• Butt-weld Pipe Fittings – A/SA 234 P1, P2, P5, P9, P11, P12, P15, P22, P91, P92, P122

Chemical Composition:

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	Carbon	Manganese	Phosphorous, max	Sulfur,  max	Silicon	Molybdenum
ASTM A335 P5	0.15max	0.30-0.60	0.025	0.025	0.50max	0.45-0.65
ASTM A335 P9	0.15max	0.30-0.60	0.025	0.025	0.25-1.00	0.90-1.10
ASTM A335 P11	0.05-0.15	0.30-0.60	0.025	0.025	0.50-1.00	0.44-0.65
ASTM A335 P22	0.05-0.15	0.30-0.60	0.025	0.025	0.50max	0.87-1.13
ASTM A335 P91	0.08-0.12	0.30-0.60	0.020	0.010	0.20-0.50	0.85-1.05
Zr 0.01 max	V 0.18-0.25	N 0.03-0.07	Ni 0.40 max	Al 0.02 max	Cb 0.06-0.10	Ti 0.01 max

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

Note: P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].

Mechanical Properties

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

A / N+T

N+T / Q+T

N+T

Material & Manufacture

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

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]

Permissible Variation in Wall Thickness

NPS [DN] Designator	Tolerance, % from Specified
		Over		Under
1/8 to 2 1/2 [6 to 65] incl., all t/D ratios		20.0%		12.5%
Above 2 1/2 [65], t/D < or = 5%		22.5%		12.5%
Above 2 1/2 [65], t/D > 5%		15.0%		12.5%
(t = Specified Wall Thickness; D = Specified Outside Diameter)

Elongation Requirements

Calculated Minimum Elongation Values
Elongation in 2 in. or 50 mm, min %
Wall Thickness		P5, P9, P11, P22			P91
in.	mm	Longitudinal	Transverse		Longitudinal
5/16 (0.312)	8	30	20		20
9/32 (0.281)	7.2	28	19		19
1/4 (0.250)	6.4	27	18		18
7/32 (0.219)	5.6	26			17
3/16 (0.188)	4.8	24			16
5/32 (0.156)	4	22			15
7/8 (0.125)	3.2	21			14
3/32 (0.094)	2.4	20			13
1/18 (0.062)	1.6	18			12

Permissible Variations in Outside Diameter

Outside Diameter at any point shall not vary from standard specified more than:

NPS [DN] Designator	Over		Under
	in.	mm	in.	mm
1/8 to 1 1/2 [6 to 40], incl.	1/64 (0.015)	0.40	1/64 (0.015)	0.40
Over 1 1/2 to 4 [40 to 100], incl.	1/32 (0.031)	0.79	1/32 (0.031)	0.79
Over 4 to 8 [100 to 200], incl.	1/16 (0.062)	1.59	1/32 (0.031)	0.79
Over 8 to 12 [200 to 300], incl.	3/32 (0.093)	2.38	1/32 (0.031)	0.79
Over 12 [300]	+/- 1% of the specified outside diameter

Ordering Information

Orders for material under this specification should include the following, as required, to describe the desired material adequately:

Quantity	Feet, meters, or number of lengths
Name of material	Seamless Alloy Steel Pipe
Grade	P5, P9, P11, P22, P91
Manufacturer	Hot-finished or cold-drawn
Size using one of the following:
NPS and Schedule Number
Outside Diameter and Nominal Wall Thickness
Outside Diameter and Minimum Wall Thickness
Inside Diameter and Nominal Wall Thickness
Inside Diameter and Minimum Wall Thickness
Length	Specific or Random
End Finish

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:
P91 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.

Hydrostatic Test

The inside diameter of the bend shall be 1 inch [25 mm].
Each length of pipe shall be Hydro tested, at option of manufacture nondestructive electric testing can be used.

Referenced Documents

• A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe
• E213 Practice for Ultrasonic Examination of Metal Pipe and Tubing
• E309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation
• E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
• E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
• E570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
• B36.10M Welded and Seamless Wrought Steel Pipe
• SAE J 1086 Practice for Numbering Metals and Alloys (UNS)
• SNT-TC-1A Recommended Practice for Nondestructive Personnel Qualification and Certification

Alloy steel specification, Standard and identification

Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.

• European Standards for steel
• The Advantages Of Alloy Steel Pipe
• ASTM Standards for steel pipes

• Alloy tube (Alloy pipe) is a kind of seamless steel pipe
• Difference between carbon steel and alloy steel
• Chrome plated steel tube

Why bevel a pipe?

Beveling can applied to the face of any size or diameter of pipe.

• How to packing the seamless pipe
• How to calculate a steel pipe theoretic weight
• Pipe connection

Alloy Steel Chemical composition

Steel Grade	Standard Number	Type	Chemical composition													Other
			C	Si	S	P	Mn	Cr	Ni	Mo	Other	ób	ós	δ5	HB
1Cr5Mo	GB1221	Bar	0.15	0.5	0.03	0.035	0.6	4-6	0.6	0.45-0.6		590	390	18
1Cr5Mo	GB6479	Pipe	0.15	0.5	0.03	0.035	0.6	4-6		0.45-0.6	Cu：0.25	390-590	195	22		ak J/cm2：118
1Cr5Mo	GB9948	Pipe	0.15	0.5	0.03	0.035	0.6	4-6	0.6	0.45-0.6	Cu：0.25	390	195	22	187	Aku　J:92
1Cr2Mo	GB9948	Pipe	0.15	0.5-1	0.03	0.035	0.3-0.6	2.15-2.85		0.45-0.65	Cu：0.25	390	175	22	179	Aku　J:92
12CrMo	GB/T3077	Bar	0.08-0.15	0.17-0.37	0.035	0.035	0.4-0.7	0.4-0.7	0.3	0.4-0.55	Cu：0.3	410	265	24	179	ψ%：60；Aku2　J:110
12CrMo	GB6479	Pipe	0.08-0.15	0.17-0.37	0.035	0.035	0.4-0.7	0.4-0.7		0.4-0.55	Cu：0.25	410-560	205	21		ak J/cm2：69
12CrMo	GB9948	Pipe	0.08-0.15	0.17-0.37	0.035	0.035	0.4-0.7	0.4-0.7	0.3	0.4-0.55	Cu：0.25	410-560	205	21	156	Aku　J:55
12CrMoG	GB5310	Pipe	0.08-0.15	0.17-0.37	0.03	0.03	0.4-0.7	0.4-0.7	0.3	0.4-0.55	Cu：0.2	410-560	205	21		Akv　J:35
12Cr1MoV	GB/T3077	Bar	0.08-0.15	0.17-0.37	0.035	0.035	0.4-0.7	0.9-1.2	0.3	0.25-0.35	V:0.15-0.3；Cu：0.3	490	245	22	179	ψ%：50；Aku2　J:71
12Cr1MoVG	GB5310	Pipe	0.08-0.15	0.17-0.37	0.03	0.03	0.4-0.7	0.9-1.2	0.3	0.25-0.35	V:0.15-0.3；Cu：0.2	470-640	255	21		Akv　J:35
12Cr1MoVg	GB713	Plate	0.08-0.15	0.17-0.37	0.03	0.03	0.4-0.7	0.9-1.2	0.3	0.25-0.35	Cu：0.3	440	245	19		Akv　J:31
12Cr2Mo	GB6479	Pipe	0.08-0.15	0.4-0.7	0.035	0.035	0.5	2-2.5		0.9-1.2	Cu：0.25	450-600	280	20		ak J/cm2：48
12Cr2MoG	GB5310	Pipe	0.08-0.15	0.5	0.03	0.03	0.4-0.7	2-2.5	0.3	0.9-1.2	Cu：0.2	450-600	280	20		Akv　J:35
15CrMo	GB/T3077	Bar	0.12-0.18	0.17-0.37	0.035	0.035	0.4-0.7	0.8-1.1	0.3	0.4-0.55	Cu：0.3	440	295	22	179	ψ%：60；Aku2　J:94
15CrMo	GB6479	Pipe	0.12-0.18	0.17-0.37	0.035	0.035	0.4-0.7	0.8-1.1		0.4-0.55	Cu：0.25	440-640	235	21		ak J/cm2：59
15CrMo	GB9948	Pipe	0.12-0.18	0.17-0.37	0.035	0.035	0.4-0.7	0.8-1.1	0.3	0.4-0.55	Cu：0.25	440-640	235	21	170	Aku　J:47
15CrMoG	GB5310	Pipe	0.12-0.18	0.17-0.37	0.03	0.03	0.4-0.7	0.8-1.1	0.3	0.4-0.55	Cu：0.2	440-640	235	21		Akv　J:35
15CrMog	GB713	Plate	0.12-0.18	0.15-0.4	0.03	0.03	0.4-0.7	0.8-1.2	0.3	0.45-0.6	Cu：0.3	450-590	295	19		Akv　J:31
15CrMoR	GB6654	Plate	0.12-0.18	0.15-0.4	0.03	0.03	0.4-0.7	0.8-1.2	0.3	0.45-0.6	Cu：0.3	450-590	295	19		Akv　J:35

ASTM A519-89 Standard specification

ASTM A519- specification covers for several grades of carbon and alloy steel mechanical tubing, either hot-finished or cold-finished.

• ASTM A519-89/ASME SA519 Material comparison tables
• ASTM A519-89/ASME SA519 Standard specification
• A519 grade 4130
• ASTM A519 carbon and alloy steel mechanical tubing

EN10216 Standard specification

EN 10216 is a European standard suitable for seamless steel tubes for pressure purposes.

 

The main steel grade：

• P195GH, P235GH, P265GH, 13CrMo4-5, 10CrMo9-10
• Other grades of steel pipe can be provided based on negotiations.