A335 Seamless Steel Pipe
ASTM A335 steel pipe may be hot finished or cold drawn and subjected to the following finishing heat treatment. The specification covers "chrome-molybdenum" seamless pipes with excellent corrosion resistance and high temperature tensile strength.
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Product Description

A335 Seamless Steel Pipe Description

ASTM A335 Pipe is a seamless ferritic alloy-steel Pipe for high temperature service. Pipe of this specification are suitable for bending, flanging, and similar forming operations, and for fusion welding. Generally, ASTM A335 P11, P22, and P91 pipelines are used for power generation and downstream oil and gas, and P5 and P9 grades are used for refinery applications. A335 steel pipe not only has high oxidation resistance and high temperature steam corrosion resistance,but also has good impact toughness,stable durable plasticity and thermal strength. A335 steel pipes are commonly used to transport high-temperature and high-pressure oil, natural gas and other media.


Product Parameters

Product Name

A335 Seamless Steel Pipe

Standard

EN/DIN/JIS/ASTM/BS/ASME/AISI etc.

Outer Diameter

Seamless: 1/4"-36"

Welding: 21.3mm-3620mm

Round Tube: 1/2"-10"

Square Tube/Rectangular Tube: 15x15mm-400x600mm

Wall Thickness

Seamless: 1.25mm-50mm

Welding: 1.65mm-65mm

Length

3-12 meters, Support customization

Surface Process

Bright, Polished, Black

Other Services

Machining(cnc), Centerless Grinding(cg), Heat Treatment, Annealing, Pickling, Polishing, Rolling, Forging, Cutting, Bending, Small Machining, etc.

 

Chemical Composition

A335

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

0.5

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

 

Mechanical Properties

A335

UNS

Yield Strength Ksi

Tensile Strength Ksi

Elongation %

P1

K11522

30

55

30

P2

K11547

30

55

30

P5

K41545

40

70

30

P9

S50400

30

60

30

P11

K11597

30

60

20

P12

K11562

32

60

30

P22

K21590

30

60

30

P91

K91560

60

85

20

 

Scope of Application

The specification covers "chrome-molybdenum" seamless pipes with excellent corrosion resistance and high temperature tensile strength. Generally, ASTM A335 P11, P22, and P91 pipelines are used for power generation and downstream oil and gas, and P5 and P9 grades are used for refinery applications.

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Product Application

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Packaging and shipping

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Factory Display

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FAQ

Q1: What types of steel products does your company primarily manufacture and supply?
A: We are a direct manufacturer specializing in carbon steel, hot-dip galvanized steel, PPGI (pre-painted galvanized iron), and stainless steel (grades 201, 304, and 316) in the form of sheets, coils, pipes, and various structural profiles, along with complementary steel structural components. Our products serve a wide range of industries, including infrastructure, photovoltaics, machinery manufacturing, chemicals, and new energy.

 

Q2: Do you support customization regarding material grades, thicknesses, and dimensions?
A: Customization is available across our entire product range. For carbon steel, galvanized steel, and stainless steel, we can adjust thickness, width, and cut-to-length dimensions according to GB, ASTM, or EN standards. Various profiles can be cut and bent based on customer drawings, and special steel grades can be produced through customized scheduling.

 

Q3: What is the difference between galvanized steel and color-coated (PPGI) steel, and how should I choose for my project?
A: Hot-dip galvanized steel features a pure zinc anti-rust layer; it is cost-effective and impact-resistant, making it ideal for mounting brackets, guardrails, and load-bearing factory structures (and it can be painted over). PPGI color-coated steel uses a galvanized base, offering both rust protection and aesthetic appeal with a wide range of colors; it is commonly used for factory roofing, wall cladding, and energy storage equipment casings. We recommend thicker galvanized coatings for projects in rainy coastal areas, color-coated sheets for outdoor projects requiring visual appeal, and weather-resistant fluorocarbon (PVDF) coatings for high-temperature desert environments.

 

Q4: Does the factory keep stock on hand, and what is the minimum order quantity (MOQ)?
A: We operate our own standardized, zoned warehouse with a capacity of over 10,000 tons, maintaining ample stock of carbon steel, galvanized steel, and stainless steel. The MOQ for standard specifications is 1 ton, though we also accept sample orders as small as a few dozen kilograms. There is no upper limit for large-scale projects, and we support mixed-load shipments combining different steel products in a single container.

 

Q5: What are the lead times for stock items versus customized products?
A: Standard stock items take 3–7 days for processing, packaging, and container loading. Simple cutting and bending orders take 7–10 days. Orders requiring mold creation or special steel customization take 15–30 days; exact delivery dates are confirmed based on the customer's specific order specifications.

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