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Analysis and Preventive Measures of Defects in Tube-Sheet Forgings Introduction Large free forging equipment is a symbol of industrial development, and the production of large forgings plays a vital role in national economic construction, defense, and cutting-edge scientific applications. As industries shift towards large-scale, high-standard equipment manufacturing, the demand for high-quality large forgings has increased. Among [...]

Stainless Steel Pipe De-greasing, Cleaning and Passivation I. De-greasing of Stainless Steel Pipes Before cleaning and passivating stainless steel pipes, they must undergo de-greasing to remove residual oils from the inner walls due to processing. Typically, industrial alcohol or dichlorodifluoromethane (CCL2F2) is used as de-greasing agents in pharmaceutical water systems. Most stainless steel pipes used in [...]

What Does NACE Mean? What Are NACE Standards and Their Applications in the Steel Pipe Industry? Annual Direct Economic Loss Due to Metal Corrosion Worldwide Every year, the direct economic loss caused by metal corrosion worldwide is estimated to be between 700billionand700billionand1 trillion. In the United States alone, corrosion losses amount to over $300 billion annually, [...]

What are the heat treatment processes for 42CrMo steel pipes? What is the corresponding hardness? 42CrMo is a commonly used alloy structural steel known for its excellent mechanical properties and heat treatment plasticity. It is widely applied in the manufacturing of mechanical components and engineering machinery. Heat treatment is one of the critical processes that enable [...]

What is Anti-Hydrogen Sulfide Corrosion Pipe Steel? In the petrochemical industry, hydrogen sulfide (H2S) corrosion is prevalent and highly hazardous. By analyzing the mechanism of H2S corrosion, this article introduces the forms of corrosion caused by wet H2S, including hydrogen blistering, hydrogen-induced cracking (HIC), sulfide stress corrosion cracking (SSCC), and stress-assisted hydrogen-induced cracking. It highlights the [...]

### Definition and Classification of Steel Pipes (Part 1) Steel pipes are hollow long steel bars that are widely used as fluid transmission pipes, such as for oil, natural gas, water, gas, steam, etc. Additionally, due to their similar bending and torsional strength but lighter weight, they are also extensively used in manufacturing mechanical parts and [...]

How Much Do You Know About the Causes of Cracking in Precision Steel Tubes? Those who frequently work with precision steel tubes likely have their own understanding of the drawbacks of these tubes. One common issue with precision steel tubes is their tendency to crack. Once a precision steel tube cracks, it needs to be repaired, [...]

Introduction to Hot Treatment Process of Wide and Thick Steel Plates Background Introduction With the continuous development and improvement of China's industrial technology level, the overall demand for wide and thick steel plates has increased in various industries such as shipbuilding, mechanical processing, coal mining equipment, mining machinery, petrochemicals, and bridge construction. Simultaneously, there is a [...]

The Repeatable Times of Quenching and Tempering Repeated quenching is a common occurrence. If the initial quenching fails or the tempering is excessive, re-quenching or re-tempering becomes necessary. However, repeated quenching can lead to quenching cracks due to the accumulation of quenching stress and coarsening of crystal grains, which increases hardenability. Consequently, the chances of deformation [...]

Deburring Methods in Metal Processing Burrs are ubiquitous in metal processing. No matter how advanced and precise the equipment is, burrs will inevitably appear on the finished product. They are primarily caused by plastic deformation of the material, resulting in unwanted excess material along the machined edges. Ductile and malleable materials are particularly susceptible to burr [...]