A333 Seamless & Welded Steel Pipe
ASTM A333 is the standard specification for seamless and welded carbon and alloy steel pipe for low temperature applications or other applications requiring notch toughness. This standard covers several grades of ferritic steel: Grade 3, Grade 4, Grade 6, Grade 7, Grade 8, Grade 9, Grade 10 and Grade 11.
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Product Description

A333 Seamless & Welded Steel Pipe Description

The main components of A333 seamless steel pipe include iron, carbon, chromium, nickel, manganese and other elements. Chromium has excellent corrosion resistance, while the addition of nickel further enhances the corrosion resistance and toughness of the material. A333 seamless steel pipe has high strength and hardness, as well as good plasticity and toughness. These excellent mechanical properties make A333 seamless steel pipe an ideal choice in many high-strength, high-corrosion-resistant application scenarios. A333 seamless steel pipe is commonly used to transport oil and natural gas with high temperature and high pressure owing to the excellent sealing and corrosion resistance.


Product Parameters

Product Name

A333 Seamless & Welded 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

A333

Grade 1

Grade 3

Grade 4

Grade 6

Grade 7

Grade 8

Grade 9

Grade 10

Grade 11

C

0.30

0.19

0.12

0.30

0.19

0.13

0.20

0.20

0.10

Mn

0.40-1.06

0.31-0.64

0.50-1.05

0.29-1.06

0.90

0.90

0.40-1.06

1.15-1.50

0.60

P

0.025

0.025

0.025

0.025

0.025

0.025

0.025

0.035

0.025

S

0.025

0.025

0.025

0.025

0.025

0.025

0.025

0.015

0.025

Si

-

0.18-0.37

0.08-0.37

0.10 min

0.13-0.32

0.13-0.32

-

0.10-0.35

0.35

Ni

-

3.18-3.82

0.47-0.98

0.40

2.03-2.57

8.40-9.60

1.60-2.24

0.25

35.0-37.0

Cr

-

-

0.44-1.01

0.30

-

-

-

0.15

0.50

Cu

-

-

0.40-0.75

0.40

-

-

0.75-1.25

0.15

-

Al

-

-

0.04-0.30

-

-

-

-

0.06

-

 

Mechanical Properties

A333

Tensile Strength min.

Yield Strength min.

Elongation % min.

Grade

psi

MPa

psi

MPa

Vertical

Transverse

Grade 1

55000

380

30000

205

35

25

Grade 3

65000

450

35000

240

30

20

Grade 4

60000

415

35000

240

30

16.5

Grade 6

60000

415

35000

240

30

16.5

Grade 7

65000

450

35000

240

30

22

Grade 8

100000

690

75000

515

22

-

Grade 9

63000

435

46000

315

28

-

Grade 10

80000

550

65000

450

22

-

Grade 11

65000

450

35000

240

18

-

 

Scope of Application

Seamless and welded steel pipes for low temperature service and other applications with the required notch toughness.

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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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