GB/T 150.2 Corrosion-Resistant Alloy Seamless Pipe for Pressure Vessels

Corrosion-resistant alloy seamless pipes for pressure vessels are used to manufacture pressure-retaining components that must withstand internal pressure, elevated temperatures, and corrosive process media. Material selection requires verification of the applicable steel grade, product standard, chemical composition, mechanical properties, heat treatment, and service conditions.

Standards clarification: GB/T 150.2 is the material-selection part of China's pressure vessel standard series, rather than a standalone seamless-pipe manufacturing specification. The current edition is GB/T 150.2-2024, which took effect on February 1, 2025, replacing GB/T 150.2-2011. The applicable pipe product standard and material grade must also be specified.

Product Overview

GB/T 150.2-compliant corrosion-resistant alloy seamless pipes are selected for pressure-vessel applications according to the vessel's design pressure, operating temperature, process medium, and required corrosion resistance. Austenitic stainless steel grades such as 06Cr19Ni10, 022Cr19Ni10, 06Cr17Ni12Mo2, and 022Cr17Ni12Mo2 are potential material options when the relevant product standard and design requirements permit their use.

For manufacturing, GB/T 13296-2023 is a relevant product standard for seamless stainless steel tubes used in boilers and heat exchangers. It specifies grades, dimensions, tolerances, technical requirements, testing, inspection, and quality documentation. Its applicability to a specific pressure-vessel component must be confirmed against GB/T 150.2-2024 and the approved design documents.

1. Product Specifications

Note: Dimensions, tolerances, heat treatment, and inspection requirements must be confirmed against the exact grade and product standard. They should not be treated as universal values for every stainless steel pressure pipe.

2. Main Characteristics

Corrosion Resistance

• 06Cr19Ni10: A general-purpose austenitic stainless steel suitable for many mildly corrosive environments.

• 022Cr19Ni10: A low-carbon grade that can reduce susceptibility to sensitization during welding.

• 06Cr17Ni12Mo2: Contains 2.00–3.00% molybdenum under GB/T 13296-2023, improving resistance to localized corrosion compared with conventional 18Cr–8Ni stainless steel in many environments.

• 022Cr17Ni12Mo2: Combines molybdenum-bearing corrosion resistance with a carbon limit of 0.030% maximum.

• 06Cr18Ni11Ti: Titanium-stabilized stainless steel designed to improve resistance to chromium-carbide-related intergranular corrosion under appropriate thermal exposure.

Actual corrosion performance depends on chloride concentration, pH, temperature, oxidizing conditions, stress, and surface condition. No single stainless steel grade is suitable for every corrosive medium.

Pressure and Temperature Suitability

Pressure resistance is determined by the permitted design stress at the operating temperature, pipe dimensions, fabrication quality, and applicable design rules. Tensile strength alone is not sufficient to establish a pipe's allowable working pressure.

Weldability and Fabrication

Austenitic stainless steel seamless pipes generally offer good fabrication and welding characteristics when the appropriate welding procedure, filler material, and post-weld requirements are followed. Low-carbon grades may be preferred for certain welded constructions, subject to engineering review.

3. Our Advantages

1. Material Traceability and Grade Verification

A pressure-vessel pipe must be identifiable by its material grade, manufacturing batch, heat-treatment condition, and inspection records. The purchasing specification should require a traceable material certificate, positive material identification where necessary, and chemical composition verification when stipulated by the project.

2. Dimensional Control for Pressure-Vessel Fabrication

Outside diameter, wall thickness, ovality, straightness, and end preparation can affect fit-up, welding, and fabrication efficiency. These parameters should be specified in the purchase order against the governing product standard, with supplementary tolerances agreed before production when required.

3. Inspection Aligned with Service Conditions

Hydrostatic testing, ultrasonic or eddy-current examination, mechanical testing, and corrosion-related testing should be selected according to the applicable standard and service risks. Additional inspection should be defined before production rather than assumed to be included in every standard supply.

4. Applicable Standards

These standards are not automatically interchangeable. A project requiring GB/T 150.2 compliance must use a material and product-standard combination accepted by the governing design documents and applicable regulations.

5. Chemical Composition

The following table summarizes five representative grades listed in GB/T 13296-2023. Values are in weight percent. The limits below are intended as a technical reference and should be checked against the controlled standard edition and the specific purchase specification before contractual use.

Important: The table is a preliminary comparison, not a substitute for the full standard. The titanium requirement and all composition limits must be confirmed from the applicable grade table before issuing a purchase specification.

6. Mechanical Properties

The following room-temperature tensile values are reference minimums for representative grades under GB/T 13296-2023. They are not allowable design stresses.

Engineering note: For final pressure-vessel selection, confirm the applicable thickness range, test specimen requirements, delivery condition, elevated-temperature properties, and design allowable stress. These values can differ from room-temperature tensile properties.

7. Application Field

Application: Corrosion-resistant process piping connected to a chemical reactor vessel

Seamless stainless steel pipes can be used for process connections carrying compatible chemical liquids between a reactor vessel and associated equipment. The grade should be selected after reviewing the fluid composition, chloride content, operating temperature, design pressure, cleaning procedure, and welding requirements. For chloride-rich or strongly reducing environments, additional corrosion assessment may be necessary before selecting a molybdenum-bearing grade.

Conclusion

Corrosion-resistant alloy seamless pipe for pressure vessels must be specified through a combination of material grade, manufacturing standard, dimensional requirements, testing, and design conditions. GB/T 150.2-2024 establishes the relevant pressure-vessel material framework, while GB/T 13296-2023 may provide the product requirements for applicable stainless steel tubes. Final acceptance depends on the approved design and the exact standard requirements.

Torich group supplies steel tubular products for industrial applications. Material grade, dimensions, inspection requirements, and documentation should be confirmed against each project's technical specification before ordering.