Hot Rolled Seamless Tube

Specification

Item	Hot rolled seamless pipe
Origin	Tianjin, China
Material	10#, 20#, 45#, Q235B, Q345B, A106 Gr.B, API 5L Gr.B
Outer Diameter	32mm – 914mm
Wall Thickness	3.0-75mm
Length	5.8m, 6m, 9m, 12m
MOQ	10 Tons
Pipe End	ASTM A106 / A53, EN 10216, API 5L, GB/T 8162, GB/T 8163, GB 3087
Delivery Status	Plain edge, weld bevel, threaded
Item	Hot rolled, normalized, annealed

Note: Alloy steels such as 40Cr, 45Mn2, 30CrMnSi, 41Cr4, S355JR, 38MnSi4, and 30ХГС can be custom-produced.

Advantages

1. Excellent mechanical properties: Maintains dimensional stability and mechanical properties under sustained high-temperature service (up to applicable standard limits).
2. Seamless construction: No weak weld areas; surface is covered with black oxide scale, allowing for various coating and secondary processing.
3. Price advantage: Due to the widespread use and simplicity of hot rolling technology, it is inexpensive and suitable for mass production and wholesale.
4. Wide range of specifications: Offers wider and larger diameters and thicker walls than cold-rolled seamless tubes, commonly used in the oil and gas industries.

Applications

• Construction and Infrastructure: Load-bearing pipes for elevated high-speed railways, cross-sea bridges, etc.; large-scale municipal drainage pipes; structural pipes for buildings.

• Energy Industry: Used as transmission pipes in oil, gas, and photovoltaic industries to ensure safe transportation.

• Electricity and Heat: Thick-walled transmission pipelines in icy and snowy areas; buried transportation pipelines; high-temperature wastewater discharge; heat exchange pipes; boiler steam pipes.

• Chemical and Mining Industries: Transportation and discharge of acidic or alkaline liquids or gases; interactive pipelines in production reaction chains; support frames for tanks or containers.

Material types and mechanical properties

Common specifications and weight

Calculation formula

Weight per meter (kg/m) = (Outer diameter mm − Wall thickness mm) × Wall thickness mm × 0.02466

(Chemical steel density 7.85 g/cm³)

Common OD and WT

 

Production process

Hot rolling is the main process for producing seamless tubes.

Mainly includes the following steps:

Billet heating → Die piercing → Rolling → Reheating of rough tube → Gradual diameter reduction → Heat treatment → Straightening → Finishing → Inspection (non-destructive, physical and chemical, bench inspection) → Warehousing

Key processes

• Piercing: This step creates the basic tube shape. The raw material is a solid round billet, which is subjected to multiple pressure tests to form a rough tube.
• Rolling: The thicker-walled rough tube is rolled and skewed multiple times to produce a rough tube with the target wall thickness.
• Finish Rolling: This step involves refined rolling to achieve a finished tube with higher precision and surface quality.

Why choose Glory Steel?

• Factory Direct Sales: Direct sales from the factory, eliminating intermediaries and controlling raw material procurement, rolling processing, and finished product delivery.

• Quality Control: We implement a comprehensive quality management system. Products meet international standards such as ASTM, EN, GB, and GOST.

• Timely Delivery: A complete hot-rolling production line ensures stable daily output. Regular order delivery times are 15–30 days, and we can meet urgent project needs.

• Flexible Response: Our technical and sales teams can respond quickly within 12 hours, providing professional technical advice and accurate quotations.

FAQ

Q1: What is the difference between hot-rolled seamless steel pipe and cold-drawn seamless steel pipe?

Hot-rolled pipes are formed at high temperatures, allowing for large diameters and thick walls at a lower cost; cold-drawn pipes offer higher dimensional accuracy, with smaller diameters and thinner walls.

Q2: Do you support customized sizes and anti-corrosion coatings?

Yes. Non-standard outer diameters, wall thicknesses, and standard lengths can all be produced; galvanizing, 3PE, and FBE anti-corrosion coatings can all be processed according to your drawings.

Q3: Can you send samples for testing free of charge?

Short samples up to 50cm are provided free of charge; the customer only needs to bear the international shipping costs. This cost will be refunded after the finished product order is placed.

Glory Steel factory, located in Tianjin, China, is an ISO 9001, ISO 14001, and CE certified factory with an annual output of 100,000 tons. We specialize in hot-rolled SMLS tubes, cold-drawn seamless tubes, as well as carbon steel welded pipes in grades Q235, Q355B. All outer diameters and wall thickness. With our high-quality products and services, we export to over 120 countries.