Seamless Ferritic Alloy Steel Pipe for Refinery Piping Systems ASTM A335/A335m

• Customization: Available
• After-sales Service: Supply
• Warranty: Supply
• Model NO.: Alloy Steel Pipe
• Type: Seamless
• Technique: Hot Rolled
• Material: Alloy Steel
• Surface Treatment: Polished
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Round
• Material Standard: ASTM A335/A335m
• Product Type: Seamless Pipe
• Steel Type: Ferritic Alloy Steel
• Target Application: Refinery Piping Systems
• Manufacturing Process: Seamless (Hot Finished or Cold Drawn)
• Tensile Strength: 415-620 MPa
• Maximum Service Temperature: 550-650°C (Grade Dependent)
• Yield Strength: 205-440 MPa (Grade Dependent)
• Normalizing Temperature: 950-1100°C
• Minimum Service Temperature: -29°C
• Design Pressure: up to 25 MPa
• Hydrostatic Test Pressure: Minimum 1.5 Times Design Pressure
• Allowable Stress Values: Per ASME B31.3
• Design Life: 20+ Years
• Corrosion Allowance: 1.5-3.0 mm
• Transport Package: Wooden Case, Packed by Bundles with Plastic Bags
• Specification: Alloy Steel
• Trademark: EZS
• Origin: China
• Production Capacity: 200000ton/Year

Product Description

Product Description

Seamless Ferritic Alloy Steel Pipe for Refinery Piping Systems ASTM A335/A335M

This seamless ferritic alloy steel pipe, manufactured to ASTM A335/A335M standards, is specifically designed for demanding refinery piping systems where high temperature and corrosion resistance are critical. The pipe's chromium-molybdenum alloy composition provides exceptional strength and durability in hydrogen-rich environments and elevated temperature services commonly encountered in refinery operations, including crude units, catalytic crackers, and hydroprocessing units. Its seamless construction ensures superior integrity with uniform wall thickness and consistent microstructure, eliminating potential weak points in high-pressure applications such as transfer lines, reactor feed/effluent systems, and furnace piping. With excellent resistance to sulfidation, hydrogen attack, and thermal fatigue, this alloy steel pipe delivers reliable long-term performance in refinery environments where safety, reliability, and continuous operation are paramount requirements.

Technical Specifications

Size Range: 1/8" to 24" NPS

Wall Thickness: SCH 20 to SCH 160

Length: Random 6-12 meters, Cut Length

End Types: Plain End, Beveled End

Surface Finish: Black, Pickled or Varnished

Inspecting

Packaging & Shipping

Chemical Composition (%)

Available Grades & Composition Ranges

Carbon (C): 0.05-0.15 (Grade dependent)
Manganese (Mn): 0.30-0.60
Phosphorus (P): ≤ 0.025
Sulfur (S): ≤ 0.025
Silicon (Si): 0.50-1.00 (Grade dependent)
Chromium (Cr): 1.00-9.50 (Grade dependent)
Molybdenum (Mo): 0.44-1.05 (Grade dependent)

P5: Cr 4.00-6.00, Mo 0.45-0.65
P9: Cr 8.00-10.00, Mo 0.90-1.10
P11: Cr 1.00-1.50, Mo 0.44-0.65
P22: Cr 1.90-2.60, Mo 0.87-1.13
P91: Cr 8.00-9.50, Mo 0.85-1.05, V 0.18-0.25, Nb 0.06-0.10, N 0.03-0.07

Production Workshop

Quality Assurance

Performance Characteristics

Advantages for Refinery Service

Mill Test Certificate 3.1/3.2
Heat Number Traceability
Chemical Analysis Certificate
Mechanical Test Report
Heat Treatment Record
Non-Destructive Test Reports
Dimensional Inspection Report

Excellent Creep Resistance (P9)
Good Oxidation Resistance (All Grades)
Superior High-Temperature Strength
Good Thermal Fatigue Resistance
Adequate Weldability with Proper Procedures
Stable Microstructure at Elevated Temperatures

Long-term Reliability in Aggressive Environments
Reduced Maintenance Costs
Improved Safety Performance
Compliance with Industry Standards
Proven Track Record in Refinery Applications
Technical Support Available

Company Profile

Premium Industrial Piping Solutions, Engineered for Excellence

EZ Steel Industrial Co.,Ltd is a leading manufacturer of high-performance industrial metal pipelines, specializing in alloy steel, carbon steel, stainless steel, and copper-nickel-based alloy products. With strategically located facilities in Cangzhou, Yangzhou, and Lishui, we deliver globally trusted piping solutions that combine cutting-edge technology, rigorous quality control, and unmatched expertise.

Empowering industries worldwide with reliable, efficient, and eco-conscious piping systems, EZ Steel Industrial Co., Ltd. is your strategic partner for mission-critical infrastructure. We deliver high-performance steel, stainless steel, and copper piping solutions for sectors including oil and gas, water treatment, HVAC, and renewable energy. Our systems are engineered to meet international standards for durability, safety, and sustainability.

With end-to-end support—from design and custom fabrication to logistics and service—we help reduce lifecycle costs, minimize environmental impact, and enhance operational resilience.

Partner with us to build future-ready infrastructure with expertise you can trust.

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