Carbon Steel Pipe

Sizes of Carbon Steel Pipe

Grade:

Note: Grades other than the a.m. chart can be made available through consultations.

Chemical Composition (%):

Note: Grades other than the a.m. chart can be made available through consultations.

Hot Rolling Seamless Steel Line Pipe Manufacturing / Production Processes

Rolled Round Billets – Examination – Cut Off – Heating – Piercing – Elongation – Slight Tension Reducing – Straightening – Corp End Cutting Off – Visual Inspection – NDT – Hydrostatic Test – Ends Processing – Product Inspection – Painting and Marking – Packing – Warehousing

Cold Drawn (Rolled) Seamless Steel Pipe Manufacturing Process

Mother pipe (Normally for hot rolled pipe) – Inspection – Annealing – Ends Treatment (Hitting and Drilling hole) – Pickling – Grinding – Phosphorization (Annoit) – Cold Drawn (Rolled) – Degreasing and Cleaning – Heat treatment (Solution treatment) – Straightening – Hydrostatic test – Painting and Marking – Warehousing

Surface Treatment of Steel Pipe:

In order to improve the service life of an oil pipeline, surface treatment is usually carried out to facilitate the firm combination of steel pipe and anti-corrosive coating. Common processing methods are: cleaning, tool derusting, pickling, and shot blasting derusting, four categories.

1. Cleaning grease, dust, lubricant, and organic matter adhered to the surface of steel pipe, usually using solvent or emulsion to clean the surface. However, the rust, oxide skin, and welding slag on the surface of the steel pipe cannot be removed, so other treatment methods are needed. Tool rust removal: Steel pipe surface oxide, rust, and welding slag can use steel wire brush to clean and polish the surface treatment. Tool derusting can be divided into manual and power; manual tool derusting can reach SA.

2. Level: Power tool derusting can reach Sa3 level. If the surface of the steel pipe is attached with a particularly strong oxide skin, it may be impossible to remove the rust with the help of tools, so we need to find other ways.

3. Pickling: common pickling methods include chemical and electrolysis. But only chemical pickling is used for pipeline corrosion protection. Chemical pickling can achieve a certain degree of cleanliness and roughness on the surface of steel pipe, which is convenient for subsequent anchor lines. Usually as a shot (sand) after reprocessing.

4. Shot blasting for rust removal by high power motor drive the high-speed rotating blades, steel grit, steel shot, segment, minerals and other abrasive wire under the action of centrifugal force on steel pipe surface spray and mass ejection, thoroughly remove rust, oxides and dirt on one hand, on the other hand, steel pipe under the action of abrasive violent impact and friction force, to achieve the required uniform roughness. Among the four treatment methods, shot blasting and derusting is an ideal treatment method for pipe derusting. Generally, shot blasting and derusting are mainly used for inner surface treatment of steel pipe, and shot blasting and derusting are mainly used for outer surface treatment of steel pipe.

Packing

Waterproof packaging

Spray paint

Standards & Specifications: Which standards do our Carbon Steel Pipes comply with?

Q: I need carbon steel pipes for a high-temperature application. Do you supply pipes according to ASTM or EN standards, and how do I choose the right grade?

A: Yes, we strictly manufacture and export pipes according to international standards.
For general structural use and pressure lines, we supply ASTM A53 Gr. B and ASTM A106 Gr. B.
For high-temperature services (boilers/refineries), ASTM A106 Gr. B/C or ASTM A335 (Alloy) is recommended, while API 5L is exclusively for oil and gas transmission lines.
For the European market, we comply with EN 10217 (welded) and EN 10216 (seamless) standards .
We always provide Mill Test Certificates (MTC) verifying the chemical composition and mechanical properties.

Export Licenses & Compliance: What is the "Export License" situation for 2025-2026?

Q: I heard China has new restrictions on steel exports. Can you ship Carbon Steel Pipes without issues in 2026?
A: As of January 1, 2026, China requires export licenses for specific steel products classified under HS Code Chapters 72 and 73 (7301-7307) .
We manage this for you: We handle the application for the Export License with the Ministry of Commerce, submitting the export contract and quality inspection certificates.
Dual-Use Items: For high-strength, corrosion-resistant alloy pipes used in specific industrial sectors, we ensure compliance with the "Dual-Use Item" permit requirements if applicable .

Minimum Order Quantity (MOQ) & Customization

Q: I only need a small batch of large-diameter pipes (20 ft) for a specific project. Do you accept small orders?
A: Yes. While standard sizes are stocked, we accept low MOQs for custom sizes. We support customized moulds for non-standard diameters and specific lengths (random or fixed) .

What certifications do you provide?

A: EN 10204 Type 3.1 mill test certificates (MTC) with full traceability to heat number, chemical analysis, mechanical properties, NDE results, and PWHT records. Type 3.2 certificates with third-party verification are also available. NACE MR0175 certification for sour service can be supplied upon request.

What is the typical lead time?

A: Stock common grades (P11, P22 in standard schedules) ship within 2-3 weeks. Custom production (P91, special diameters/wall thicknesses) requires 4-6 weeks. Rush orders possible with surcharge.