Products

ASTM A335 Alloy Steel Pipe

Standard

ASTM A335

Grade

P1,P2,P5,P9,P11,P91,P92

OD

10.3-660mm

WT

1.6-60mm

Length

5.8m-12m or random legth

Description

A335 P9 Alloy Steel Pipe ASTM A335/ASME SA335 Gr. P5, P9, P11, P22, P91

Standard: ASTM A335
grade:P1, P2,P5,P9,P11,P91,P92
OD:10.3-660mm
WT:1.6-60mm
Length:5.8m-12m or random legth
Technical: Quenching & Tempering
Application: Gas fire power plant, coal fire power plant, headers and steam lines, Feed water pipes, superheaters, and reheaters.

A335 P9 Alloy Steel Pipe that covers “chrome-moly” seamless pipes with remarkable resistance to corrosion and good tensile strength at high-temperature service. Generally, ASTM A335 P11, P22, and P91 pipes are used in power generation and downstream oil and gas, P5 and P9 grades are for refinery applications.

How to define alloy pipes?
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 (for 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 applications with very high pressures.
ASTM A335 alloy steel pipes fit ASTM A234 WPx series buttweld fittings (WP5, WP9, WP91) and A182 Fx forged fittings and flanges (A182 F5, F9, F11, F22, F91). All these materials have similar chemical and mechanical properties and can be joined or welded.

Alloying elements
The addition of Molybdenum (“Moly”) increases the strength of the steel and its elastic limit, enhances 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:
1. Aluminum: decreases oxygen from steelmaking
2. Boron: used to produce fine grain size and enhance steel hardness
3. Cobalt: used to enhance the steel’s heat and wear-resistance
4. Manganese: gives better steel hardenability
5. Nickel: Enhances toughness, hardenability, and impact strength at low temperatures
6. Silicon: decreases oxygen, enhances hardenability and toughness
7. Titanium: prevents precipitation of chromium carbide
8. Tungsten: refines steel grain size and enhance the steel hardness, especially at high temperatures
9. 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.

CHEMICAL COMPOSITION
The types of alloy steel covered by the ASTM A335 – ASME SA335 specification are designed with a “P” prefix, from P5 to P92. Grades P11/P22 and P91/92 are typically found in power stations, whereas grade P5 and P9 are more common for application in the petrochemical industry. Grades P9 and P91 are in the list, the more expensive (a P91 seamless pipe may cost approx 5€ per kg.).

ASTM A335
Low-Alloy Steel
(Grades)
UNS
equivalent
C≤MnP≤S≤Si≤CrMo
P1K115220.10~0.200.30~0.800.0250.0250.10~0.500.44~0.65
P2K115470.10~0.200.30~0.610.0250.0250.10~0.300.50~0.810.44~0.65
P5K415450.150.30~0.600.0250.0250.54.00~6.000.44~0.65
P5bK515450.150.30~0.600.0250.0251.00~2.004.00~6.000.44~0.65
P5cK412450.120.30~0.600.0250.0250.54.00~6.000.44~0.65
P9S504000.150.30~0.600.0250.0250.50~1.008.00~10.000.44~0.65
P11K115970.05~0.150.30~0.610.0250.0250.50~1.001.00~1.500.44~0.65
P12K115620.05~0.150.30~0.600.0250.0250.50.80~1.250.44~0.65
P15K115780.05~0.150.30~0.600.0250.0251.15~1.650.44~0.65
P21K315450.05~0.150.30~0.600.0250.0250.52.65~3.350.80~1.60
P22K215900.05~0.150.30~0.600.0250.0250.51.90~2.600.87~1.13
P91K915600.08~0.120.30~0.600.020.010.20~0.508.00~9.500.85~1.05
P92K924600.07~0.130.30~0.600.020.010.58.50~9.500.30~0.60

MECHANICAL PROPERTIES

A335 Low-Alloy PipeUNS NumberYield Strength ksiTensile Strength ksiElongation %RockwellBrinell
P1K11522305530
P2K11547305530
P5K41545407030207 max
P9S50400306030
P11K11597306020
P12K11562326030174 max
P22K21590306030
P91K91560608520

TESTING REQUIREMENTS
1.Transverse/longitudinal: tension and flattening, hardness, bend tests- for material that has been heat-treated in batch furnaces, these tests shall be made on the 5% of the pipes from each heat lot number. For smaller lots, one pipe at a minimum has to be tested
2.ASTM A335 Gr. P91 shall have a hardness of 250 HB / 265 HV (25 HRC)
3.Hydro testing: shall be applied to every length of pipe
4.The non-destructive electric test is optional

TOLERANCES

A335 PipeOverUnder
NPS [DN]in.mmin.mm
1/8 to 1 1/2 / DN 6 to 401/64 (0.015)0.41/64 (0.015)0.4
Over 1 1/2 to 4 / DN 40 to 1001/32 (0.031)0.791/32 (0.031)0.79
Over 4 to 8 / DN 100 to 2001/16 (0.062)1.591/32 (0.031)0.79
Over 8 to 12 / DN 200 to 3003/32 (0.093)2.381/32 (0.031)0.79
Over 12 / > DN 300+/- 1% of the specified outside diameter

DIAMETER WALL THICKNESS
The tolerances in WT, in %, from specified are:
1.1/8 to 2 1/2 [6 to 65] incl., all t/D ratios: over 20%, under 12.5%
2.Above 2 1/2 [65], t/D < or = 5%: over 22.5%, under 12.5%
3.Above 2 1/2 [65], t/D > 5%: over 15%, under 12.5%
4.t = Specified Wall Thickness; D = Specified Outside Diameter)

ALLOY PIPE CROSS REFERENCE TABLE ASTM vs. EN GRADES

Chrome Moly Pipes: Werkstoff vs EN vs ASTM  
Werkstoff /DINENASTM
1.541516Mo3A335 Grade P1
1.733513CrMo4-5A335 Grade P11, P12
1.738010CrMo9-10A335 Grade P22
1.7362X11CrMo5A335 Grade P5
A335 Grade P9
1.4903X10CrMoVNb9-1A335 Grade P91

A335 steel pipe Heat Treatment:
A335 pipes shall be reheated and furnished in the full-annealed, iso thermal annealed, or normalized and tempered condition. If furnished in the normalized and tempered condition, the minimum tempering temperature for Grades P5, P5b, P9, P21, and P22 shall be1250°F [675°C], the minimum tempering temperature for Grades P1, P2, P11, P12, and P 15 shall be 1200°F [650°C].
Pipe of Grades P1, P2, and P12, either hot-finished or cold drawn, may be given a final heat treatment at 1200°F[650°C] to 1300°F [705°C] instead of heat treatments.
Hot Tags: ASTM A335 Alloy Steel Pipe, a335 p9 pipe,A335 p91 manufacturers, suppliers, factory

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