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How to determine the post-weld heat treatment temperature of T/P91 alloy steel?

T/P91 alloy steel is widely used in high-temperature and high-pressure piping systems, especially in power and petrochemical industries. While its welding and heat treatment processes are well-documented, there remains some confusion and inconsistency in practical applications, particularly regarding the selection of post-weld heat treatment (PWHT) temperatures and durations. This article offers a practical perspective

2026-01-28T06:02:08+00:00August 8th, 2025|Industrial Articles|
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How Composition, Structure, and Processing Shape 125ksi Super Martensitic Pipes

Oil and natural gas are vital national strategic resources. As exploration and production shift toward deepwater offshore fields, deep terrestrial formations, and unconventional resources, the demand for high-performance materials, particularly high-end specialty steels, has increased significantly. These demanding environments require steel materials with exceptional strength, corrosion resistance, and reliability. To address this rising demand,

2026-01-28T06:02:08+00:00August 8th, 2025|Industrial Articles|
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Ultra Alloy 825: The Optimal Choice for Oil and Gas Industry – Superior Performance in Sour Gas Environments

 Ultra Alloy 825: The Optimal Choice for Oil and Gas IndustryOur customers in the oil and gas industry are increasingly turning to Ultra Alloy 825 according to our Ultra Alloy 825 product manual, as it demonstrates exceptional performance in demanding operating environments, particularly in "sour" sulfur-containing environments.Ultra Alloy 825 is a titanium-stabilized nickel-based alloy with

2026-01-28T06:02:08+00:00June 17th, 2025|Industrial Articles|
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China’s Pressure Vessel Materials Reach World-Class Standards: Comprehensive Development from 2000-2020

China's Pressure Vessel Materials Reach World-Class Standards: Comprehensive Development from 2000-2020The rapid development of petrochemical and coal chemical industries from 2000 to 2020 has driven pressure vessel products toward larger scale and higher parameter specifications. This period has witnessed remarkable achievements in the research, development, and application of high-temperature, high-pressure, and corrosion-resistant materials. Key domestic

2026-01-28T06:02:08+00:00June 17th, 2025|Industrial Articles|
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Control Method for Double-sided Formation with Single-pass Single-side Submerged Arc Welding in Steel Strip Butt Joints for Spiral Welded Pipes

Keywords: SAWH pipe, steel strip, single pass, single-side submerged arc welding double-side formation In spiral welded pipe production, steel strip butt joints typically require front-side submerged arc welding at the butt joint position, followed by root cleaning and back-side submerged arc welding after pipe formation. To eliminate the back-side welding process and improve efficiency,

2026-01-28T06:02:34+00:00January 20th, 2025|Industrial Articles|
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Analysis and Application of TIG Repair Welding Technology for Small-sized Spiral Welded Pipe

Abstract The repair welding process for small-diameter spiral welded steel pipes has long been constrained by spatial limitations. Due to the small diameter, workers cannot use electrode arc welding to repair inner weld defects, making welding quality a bottleneck restricting enterprise development. To ensure product quality, the company employs TIG welding repair technology for

2026-01-28T06:02:34+00:00January 17th, 2025|Industrial Articles|
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AISI 4147 Steel Quenching Guide: Water-Based vs. Oil-Based Performance Analysis

Introduction With the rapid development of hydrogen energy infrastructure, the demand for large-diameter high-pressure storage cylinders continues to grow. AISI 4147 steel has emerged as an ideal material for manufacturing these critical components. This comprehensive analysis explores the impact of different quenching media on AISI 4147 steel properties. Industry Background and Significance Market Trends

2026-01-28T06:02:34+00:00January 16th, 2025|Industrial Articles|
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Comparative Analysis of X80 Seamless and Straight-seam Steel Elbows

Natural gas plays an increasingly important role in economic development as a cleaner energy source. Over the years, China has constructed several large-diameter natural gas pipelines, utilizing X80-grade steel pipes, such as the second and third generations of large-diameter pipelines. However, the construction of long-distance pipelines often faces challenging geological and climatic conditions, imposing

2026-01-28T06:02:34+00:00January 14th, 2025|Industrial Articles|
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Analysis of Tubing Fracture in Ultra-Deep Well

Background A significant tubing failure occurred in an ultra-deep well, with measured depths of 8,483.7 m and vertical depths of 8,228 m. The failures were observed in the 5th tubing and the 236th tubing, with specifications of Φ88.9 mm × 9.52 mm 110S and Φ88.9 mm × 6.45 mm 110S, respectively. Tubing 1–5: Slight

2026-01-28T06:02:34+00:00January 13th, 2025|Industrial Articles|
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The Benefits of Using AISI 4340 Alloy Steel Bar in Petroleum Equipment Manufacturing

Introduction In the demanding field of petroleum equipment manufacturing, selecting the right material is crucial for ensuring the reliability and longevity of the machinery. AISI 4340 alloy steel bar has emerged as a top choice for many manufacturers due to its exceptional mechanical properties. This high-strength, low-alloy steel is renowned for its toughness, fatigue

2026-01-28T06:02:34+00:00December 5th, 2024|Industrial Articles|
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ShunFu Metal Co., Ltd. is one of the largest high quality oilfields product manufacturers in China, and its products cover various oilfields such as gas pipe, oil casing, tubing, anti-corrosion line pipe, corrosion resistance alloy pipe, etc. …
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