Name: China GOST 10704-91 159mmx7.92mm ST20 Manufacturers Suppliers Factory - Huayang Steel Pipe
Brand: Huayang
SKU: 305318287

Hebei Huayang Steel Pipe Co., Ltd is one of the most experienced manufacturers and suppliers of gost 10704-91 159mmx7.92mm st20 in China. Welcome to buy discount gost 10704-91 159mmx7.92mm st20 made in China here from our factory. Quality products and low price are available.

Product introduction

Product Description

API Spec 5L 426mm×11mm X60M PSL2 -20℃ Impact Steel Pipe is a high-standard medium-caliber longitudinal submerged arc welded (LSAW) line pipe, strictly manufactured in accordance with API Spec 5L latest industrial specifications. Designed specifically for medium and high-pressure long-distance transmission of crude oil, natural gas and petrochemical media, this pipe features fixed dimension 426mm outer diameter and 11mm wall thickness, matched with X60M thermo-mechanical controlled rolling steel grade and PSL2 high-level quality standard.

Different from conventional PSL1 pipelines, this PSL2 grade pipe implements stricter chemical composition control, higher dimensional accuracy and mandatory low-temperature impact performance. It is specially certified for -20℃ Charpy V-notch impact test, with excellent low-temperature toughness and anti-brittle fracture capacity, fully adapting to temperate and low-temperature regional pipeline laying environments. All finished pipes undergo 100% hydrostatic pressure test, full weld ultrasonic & radiographic non-destructive inspection, meeting strict safety requirements for oil & gas trunk pipeline projects. Customizable 3PE, FBE anti-corrosion and internal epoxy lining greatly extend service life, serving as the preferred pipeline for global petroleum and natural gas transmission engineering.

1. Basic Product Specifications

Product Name: API Spec 5L 426mmx11mm X60M PSL2 Steel Pipe
Executive Standard: API Spec 5L (Latest Version)
Fixed Dimension: Outer Diameter 426mm, Wall Thickness 11mm
Steel Grade: X60M (Thermo-Mechanical Controlled Process)
Quality Level: PSL2 (Premium Specification Level 2)
Low-Temperature Performance: Mandatory -20℃ Charpy Impact Test Qualified
Production Process: LSAW longitudinal submerged arc welding, online internal & external burr removal, weld stress relief treatment
Standard Length: 6m, 12m; customized fixed length available
Applicable Media: Natural gas, crude oil, refined oil, low-corrosive petrochemical media
Working Pressure: Suitable for medium and high-pressure oil & gas trunk transmission systems
Pipe End Treatment: 30°–37.5° beveled welding ends, plastic anti-collision end caps
Surface Treatment: Black anti-rust oil, hot dip galvanized, 2PE/3PE external anti-corrosion, FBE coating, internal epoxy lining optional
Core Features: API 5L PSL2 premium grade, X60M TMCP steel, -20℃ low-temperature toughness, high pressure resistance, zero leakage, strict flaw detection, dedicated for oil & gas trunk pipelines

2. Core Product Advantages

2.1 PSL2 Premium Grade Strict Quality Control

As API 5L PSL2 high-standard pipeline, it adopts stricter chemical component limitation, lower impurity content and more precise dimensional tolerance than PSL1 products. It supports full batch performance traceability, mandatory low-temperature impact test and strict weld flaw detection, effectively avoiding pipeline failure risks under complex working conditions, fully compliant with international high-standard oil and gas project acceptance norms.

2.2 X60M TMCP Steel Excellent Mechanical Performance

X60M steel is produced by thermo-mechanical controlled rolling process, with fine and uniform internal grain structure. It balances high strength and excellent toughness, features outstanding weldability and low residual stress, no need for secondary heat treatment in most scenarios. The material effectively resists pipeline stress deformation and fatigue damage during long-term high-pressure medium transmission.

2.3 Professional -20℃ Low-Temperature Impact Resistance

The product completes standardized Charpy V-notch impact test at -20℃ with qualified impact energy, solving the brittle fracture hidden danger of ordinary steel pipes in low-temperature environments. It stably adapts to seasonal temperature alternation and low-temperature regional laying, ensuring long-term safe operation of oil and gas pipelines in temperate and cold zones.

2.4 High-Integrity Weld Structure & Zero Leakage

Adopting automatic double-sided submerged arc welding technology, the weld and pipe body achieve complete metallurgical fusion without pores, slag inclusions or microcracks. Combined with online weld stress relief treatment and 100% full-length hydrostatic test + UT/RT non-destructive inspection, the pipeline maintains excellent airtightness and pressure resistance, completely meeting the safety requirements of high-pressure oil and gas transmission.

2.5 426mm Standard Caliber & Strong Compatibility

426mm conventional medium caliber is a mainstream specification for oil and gas branch trunk lines, fully matching standard API elbows, tees, flanges and valves. The standard size ensures high fitting compatibility, convenient on-site welding and installation, shortens project construction cycle and reduces overall engineering supporting costs.

2.6 Diversified Anti-Corrosion & Long Service Life

Multiple mature anti-corrosion processes are optional for different laying environments: 3PE coating for buried soil anti-corrosion, FBE coating for high-temperature and corrosive working conditions, internal epoxy lining for preventing medium adhesion and wax deposition. Effectively resist soil corrosion, atmospheric corrosion and medium erosion, extending pipeline service life up to 40 years.

3. Dimensional Tolerance Standard (API 5L)

Inspection Item	Standard Tolerance
Outer Diameter (426mm)	±1.0% of nominal OD
Wall Thickness (11mm)	+12% / −10%
Pipe Straightness	≤1.5mm per meter
Out-of-Roundness	≤1.0% of outer diameter
Pipe Length	+100mm / −0mm

4. Mechanical & Chemical Properties (X60M PSL2)

4.1 Mechanical Properties

Steel Grade	Min. Yield Strength	Tensile Strength	Min. Elongation	Core Test Item
X60M PSL2	≥415MPa	517–758MPa	≥18%	-20℃ Charpy Impact Qualified + 100% Hydrostatic Test

4.2 Chemical Composition (Max, PSL2)

C	Si	Mn	P	S
0.12%	0.40%	1.60%	0.020%	0.010%

Note: All pipes pass flattening test, reverse bend test and weld tightness test; -20℃ low-temperature impact test report can be provided for project acceptance.

5. Manufacturing Process

Raw Material Inspection: Adopt API 5L standard X60M TMCP steel plates, strictly inspect chemical composition and mechanical properties, focus on low-temperature toughness indicators to ensure compliance with PSL2 requirements.
Plate Edge Milling: Precision edge planing and deburring to ensure flat welding gap and high welding seam uniformity.
Multi-Roll Precision Forming: Gradual circular forming to guarantee uniform roundness and consistent wall thickness of 426mm pipe blank.
Double-Sided Submerged Arc Welding: Automatic closed-loop parameter control to realize full penetration welding, stable weld quality.
Weld Burr Removal: Online internal and external weld scarving to remove residual flash, ensure smooth inner pipe wall and low fluid resistance.
Weld Stress Relief Treatment: Eliminate welding residual stress, improve weld toughness and low-temperature resistance.
Sizing & Straightening: Precision calibration to standard 426mm outer diameter, correct pipe linearity to meet API tolerance standards.
Fixed-Length Cutting: Neat burr-free cutting according to customer required length.
Full Standard Inspection: 100% hydrostatic pressure test, full weld UT/RT non-destructive flaw detection, -20℃ low-temperature impact test and full dimensional recheck.
Marking & Anti-Corrosion Treatment: Laser permanent marking of API standard, grade, dimension, batch number; customized anti-rust and anti-corrosion coating processing.
Export Standard Packaging: PE film waterproof wrapping, high-strength steel strip bundling, plastic end caps protection for long-distance sea and land transportation.

6. Main Application Scope

Medium and long-distance trunk pipelines for onshore crude oil and natural gas transmission
Oil field gathering and transportation pipelines, well site connecting and station matching pipelines
Petrochemical plant medium-pressure process fluid and product oil transmission pipelines
Low-temperature seasonal change areas and temperate zone oil & gas pipeline projects
Municipal natural gas main pipe network and large energy supporting projects
Global EPC petroleum energy projects requiring API 5L PSL2 & low-temperature impact certification

7. Quality Inspection & Certification

Strictly compliant with API Spec 5L international petroleum pipeline standard
PSL2 premium level production, with stricter quality control than conventional PSL1 pipes
Completed mandatory -20℃ Charpy low-temperature impact test and full weld NDT inspection
100% full-length hydrostatic pressure test to ensure pipeline airtightness
Complete Mill Test Report (MTR) and API qualification certificates provided
Support SGS, BV, TUV third-party sampling inspection and project acceptance
ISO 9001 quality management system certified production
Full batch traceability from raw materials to finished products delivery

8. Packaging & Delivery

Packaging: Black anti-rust oil coating, waterproof PE film wrapping, heavy-duty steel strip bundling, plastic anti-collision end caps for pipe ends; anti-corrosion pipes with enhanced wear-resistant packaging.
Product Marking: Laser permanent marking including API 5L standard, X60M PSL2 grade, 426×11mm dimension, batch number, impact test temperature and production date.
Trade Terms: FOB, CIF, CFR, DAP global delivery support
Shipping Ports: Tianjin, Qingdao, Shanghai, Ningbo
Customization Service: Custom fixed length, 3PE/FBE/epoxy anti-corrosion coating, special pipe end processing
Delivery Cycle: Conventional specifications 7–12 working days; customized anti-corrosion products 12–20 working days

9. Why Choose Our API 5L 426mm×11mm X60M PSL2 Pipe

Premium PSL2 X60M Grade: Adopt TMCP controlled rolling process, stable mechanical performance, meet international high-standard energy project requirements
Certified -20℃ Low-Temperature Toughness: Professional low-temperature impact test qualified, adapt to variable temperature and low-temperature service environments
Strict API Standard Production: Full-process compliance with API 5L specifications, precise dimensional tolerance and stable batch quality
Zero Leakage Weld Performance: Double-sided submerged arc welding + full flaw detection, reliable for long-term high-pressure oil & gas transmission
Professional Project Matching: Standard caliber with high fitting compatibility, reduce project construction and matching costs
Complete Certification & Inspection: Full MTR documents and third-party inspection support, convenient for global project acceptance

About us

Company gate (overlooking view)

Hebei Huayang Steel Pipe Co., Ltd. was founded in 2005, with a registered capital of 500 million yuan. The company covers an area of more than 1,000 mu, with annual sales of 10 billion yuan, more than 600 employees and an annual productivity of 2.75 million tons. The company has 17 new automatic steel pipe production lines and 14 high-frequency production lines, with a diameter of 73-660 mm; Three double-sided submerged arc welded steel pipe production lines with diameters of 406.4-1422.4mm;; 24 hot tube expanding production lines, with a diameter of 230-820mm; Two anticorrosion steel pipe production lines with a diameter of 73-1626 mm; 2 automatic painting production lines. With 3 branches and 5 offices, the products are sold to various cities and exported to more than 80 countries such as Southeast Asia, Middle East, Europe and America.

Packaging, transportation and delivery

Steel pipe packaging and loading scene

Packaging, transportation and delivery

At Hebei Huayang Steel Pipe Co., Ltd., we apply standardized and reliable packaging solutions for all our steel pipe products. Our pipes can be securely packed by hexagonal bundling or circular bundling according to product diameter, wall thickness and customer requirements. Each pipe end is protected with high‑strength plastic pipe caps to avoid collision damage, dust and moisture during transportation and storage. The whole bundle is firmly wrapped with durable woven bags to enhance stability and prevent scratches or deformation.

We support a complete range of transportation methods to satisfy global customers, including road transportation, railway transportation, sea freight and container shipping. Based on our strategic location in Cangzhou, Hebei Province, we enjoy convenient access to major ports such as Tianjin Port, which greatly improves logistics efficiency and reduces transportation costs.

For standard specifications and normal order quantities, the general delivery time is about 30 days after order confirmation and deposit receipt. For large‑scale orders, special sizes or customized processing requirements, our production and sales team will formulate a detailed production plan and provide an accurate delivery schedule accordingly to ensure on‑time supply and stable performance for projects and clients worldwide.

Strict quality control

1. During and after the production, experienced quality inspectors randomly check the products to ensure that each steel pipe is qualified for production and application.

2. A nationally recognized laboratory with CNAS certification and certification by French Classification Society.

3. Have CNOOC access certificate, KOC oil company access network, ADNOC Abu Dhabi oil company access network, Petrobras access network, etc.

4. Accept the inspection by the third party designated/paid by the buyer, such as SGS and BV.