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Alloy Steel Pipe

  • Keywords: Alloy Steel Pipe, Alloy Steel Tube, Seamless Alloy Steel Tube, Seamless Alloy Steel Pipe, Alloy Round Tube
  • Size: Outside Diameter: 1/8'' ~ 26''; Wall Thickness: SCH 30, 30, 40, 60, 80, 120, 140, 160, XS, XXS, STD; Length: Single Random, Double Random, Cut Length max to 23m
  • Feature: High Temperature Alloy Steel Tube, Alloy Pressure Pipe
  • Standard & Grade: ASTM A333, A335 P5/P9/P11/P22/P91, DIN 17175, JIS G3458
  • Ends: Plain End, Beveled End, Thread End
  • Usage: Used for low-pressure liquid delivery, Such As Water, Gas, And Oil
  • Delivery: Within 30 Days and Depends on Your Order Quantity
  • Packing: Bundled with Hemp Rope/In Bulk
Availability:
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Alloy steel pipe, a high-performance variant of seamless steel tubing, is formulated with a higher chromium content to achieve superior mechanical and chemical resistance. Compared to conventional seamless pipes, it exhibits markedly improved stability under thermal stress, low-temperature brittleness, and corrosive attack. These properties render it essential for mission-critical installations in the petroleum, aerospace, chemical processing, electric utility, boiler, and military sectors.


Standard

A335 Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
A213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
A209 Standard Specification for Seamless Carbon-Molybdenum Alloy-Steel Boiler and Superheater Tubes



High-temperature alloy steel tubes are known as chrome moly pipe.


ASTM A213 and A209 specifications cover alloy steel seamless tubes for high-temperature service. Seamless alloy steel tubes are suitable for bending and similar forming operations, and for fusion welding at high temperatures. High-temperature alloy steel tubes are also considered as low alloy chrome moly grades.

ASTM/ASME A/SA213 Gr. T2, T11, T12, T22, T91, T92

ASTM/ASME A/SA335 Gr. P1, P2, P5, P11, P12, P22

ASTM/ASME A/SA209 T1, T1a, T1b

ASTM A213 tubing has been widely used in high-temperature services, especially for the boiler and superheater. Tube material could be in alloy steel and stainless steel, and manufactured in seamless or cold drawn. Common grades are T9, T11, T12, T21, T22, T91 and stainless grades in TP304 or TP316.


The A335 pipes are generally called chrome moly pipe, it is a type of seamless pipe could be used in high temperature environments of 540 – 750 °C, they have a high level of Chromium and Molybdenum presence in it, While Molybdenum increases the overall strength, resistance, elasticity, hardenability and overall quality, moly ensures that the material is more resistant to softening, restrains the growth of grains and lessens the chances of embrittlement. It is the single additive that is responsible for the increase in high-temperature resistance, and it also improves the corrosion resistance of steel.


The chrome moly pipe featured grades are ASTM A335 P9, P11, P22, P91, so it could also be called a P-grade pipe in some cases. P11 pipe, P22 pipe, and P91 pipes are used in power industry and petrochemical plants; meanwhile, P5 and P9 pipe generally find usage in refineries.


ASTM A209 / A209M, ASME SA209 T1, T1a, T1b is the standard applicable to seamless carbon-Molybdenum Alloy-Steel Boiler and Superheater Tubes.



Seamless Alloy Steel Tube Application:

1. Construction hall structure, sea trestle, airport structure, shipbuilding, security door frames, garage doors, strengthening liners of steel doors and windows, indoor partition walls, cable bridge structures and expressway safety guards, balustrade, decorating, residential, ornamental pipes.

2. Agriculture: Agricultural equipment.

3. Industry machinery,  solar stent, offshore oil field, mine equipment, electromechanical hardware, heavy engineering, mining and resources, process engineering, materials handling, mechanical parts.

4. Traffic: walking rails, roll-up doors, guardrail, plaza structure, signage, road furniture, fencing, logistics storage supermarket shelves, containers, transport industries, commercial construction other sports apparatus, leisure equipment, furniture, school furniture.

5. Material storage racks, pallets, hydraulic platforms, trusses, columns, purlins, greenhouse stands, towers.





Outside Diameter & Tolerance

ASTM A450 Hot rolled Outside Diameter, mm Tolerance, mm
OD≤101.6 +0.4/-0.8
101.6＜OD≤190.5 +0.4/-1.2
190.5＜OD≤228.6 +0.4/-1.6
Cold Drawn Outside Diameter, mm Tolerance, mm
OD＜25.4 ±0.10
25.4≤OD≤38.1 ±0.15
38.1＜OD＜50.8 ±0.20
50.8≤OD＜63.5 ±0.25
63.5≤OD＜76.2 ±0.30
76.2≤OD≤101.6 ±0.38
101.6＜OD≤190.5 +0.38/-0.64
190.5＜OD≤228.6 +0.38/-1.14
ASTM A530 & ASTM A335 NPS Outside Diameter, inch Tolerance, mm
1/8≤OD≤1-1/2 ±0.40
1-1/2＜OD≤4 ±0.79
4＜OD≤8 +1.59/-0.79
8＜OD≤12 +2.38/-0.79
OD>12 ±1%


Wall thickness & Tolerance

ASTM A450 Hot rolled Outside Diameter, mm Tolerance, %
OD≤101.6, WT≤2.4 +40/-0
OD≤101.6, 2.4＜WT≤3.8 +35/-0
OD≤101.6, 3.8＜WT≤4.6 +33/-0
OD≤101.6, WT>4.6 +28/-0
OD>101.6, 2.4＜WT≤3.8 +35/-0
OD>101.6, 3.8＜WT≤4.6 +33/-0
OD>101.6, WT>4.6 +28/-0
Cold Drawn Outside Diameter, mm Tolerance, %
OD≤38.1 +20/-0
OD>38.1 +22/-0
ASTM A530 NPS Outside Diameter, inch Tolerance, %
1/8≤OD≤2-1/2 +20.0/-12.5
3≤OD≤18, WT/OD≤5% +22.5/-12.5
3≤OD≤18, WT/OD>5% +15.0/-12.5
OD≥20, WT/OD≤5% +22.5/-12.5
OD≥20, WT/OD>5% +15.0/-12.5


Length: 5800mm; 6000mm; 6096mm; 11800mm; 12000mm; and so on.

Max length: 16000mm

Keyword: High Pressure Steel Pipe, Boiler Steel Pipe, ASME SA335, P11, ASTM A335

ASTM ASME (S)A-335/(S)A-335M Grade and Chemical Composition

Chemical  Composition

C, %

Mn, %

P, %

S, %

Si, %

Cr, %

Mo, %

0.05-0.15

0.30-0.60

0.025 max

0.025 max

0.50-1.00

1.00-1.50

0.44-0.65


Mechanical Properties

Tensile Strength, MPa

Yield Strength, MPa

Elongation, %

415 min

205 min

30 min


Grade UNS 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 0.50 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 0.50 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 0.50 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 0.50 2.65~3.35 0.80~1.60
P22 K21590 0.05~0.15 0.30~0.60 0.025 0.025 0.50 1.90~2.60 0.87~1.13
P91 K91560 0.08~0.12 0.30~0.60 0.020 0.010 0.20~0.50 8.00~9.50 0.85~1.05
P92 K92460 0.07~0.13 0.30~0.60 0.020 0.010 0.50 8.50~9.50 0.30~0.60

Note:

(S)A335 P91 other chemical composition are : V 0.18~0.25; N 0.030~0.070; Ni ≤ 0.40; Al ≤ 0.04 ; Nb 0.06~0.10

(S)A335 P92 other chemical composition are : V 0.15~0.25; N 0.030~0.070; Ni ≤ 0.40; Al ≤ 0.04 ; Nb 0.04~0.09; W 1.5~2.00 ; B 0.001~0.006


Painting & Coating: Oiled or black-painted to prevent rust

alloy-steel-pipe-manufacturing-process


Packing

alloy-steel-pipe-packing

Q1: What is the difference between Alloy Welded Pipe and Seamless Pipe?

A: Seamless pipes are made from a solid billet and have no weld seam, making them theoretically stronger in high-pressure applications. However, modern welding technologies (like SAW) have made alloy welded pipes equally reliable for many high-pressure and high-temperature applications. Welded pipes are generally more cost-effective, especially in larger diameters, and offer better dimensional consistency in wall thickness.



Q2: Can you supply pipes for high-temperature service?

A: Yes, absolutely. Our alloy welded pipes, particularly those conforming to ASTM A691 (e.g., Grade 2 1/4CR, 5CR, 9CR), are specifically designed for high-temperature and high-pressure service. They offer excellent creep resistance and oxidation resistance, making them suitable for power plant piping and refineries.



Q3: What testing is performed on your alloy pipes?

A: We perform comprehensive testing to ensure quality. This includes Chemical Composition Analysis, Mechanical Property Testing (Tensile, Yield, Elongation), Hydrostatic Testing, and Non-Destructive Testing (NDT) such as Ultrasonic Testing (UT), Radiographic Testing (RT), and Dye Penetrant Testing (PT). We can also provide Impact Testing for low-temperature applications.



Q4: What is your delivery time?

A: The delivery time depends on the quantity and specifications of the order. Generally, for standard alloy grades and sizes, the lead time is approximately 30 to 45 days after receiving the deposit. Custom sizes or specific heat treatment requirements may take slightly longer.



Q5: Do you provide samples?

A: Yes, we can provide samples for evaluation purposes. However, depending on the alloy grade (which can be expensive due to raw material costs like Molybdenum and Chromium), there may be a charge for the sample and freight, which can be deducted from the final order value.


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