Knowledge

• 24/Oct2025

  Does the Q355GNH steel have any special heat treatment requirements?

  Q355GNH steel does have specific heat treatment requirements, which are primarily designed to optimize its weathering corrosion resistance, mechanical properties (strength, toughness), and microstruct

• 24/Oct2025

  How does the impact toughness of Q355GNH change with temperature?

  The impact toughness of Q355GNH (a Chinese standard weathering steel, equivalent to Corten-like steels) typically exhibits a temperature-dependent trend common to most structural steels: it generally

• 24/Oct2025

  What is the effect of different welding techniques on the quality of S355J2W ...

  Different welding techniques have significant impacts on the quality of S355J2W welds, affecting aspects such as microstructure, mechanical properties, residual stress, and appearance.

• 24/Oct2025

  Stainless Steel Grades 310 & 310S – High-Temperature Alloys from Gnee Steel

  Discover the high-temperature performance of Stainless Steel Grades 310 and 310S — engineered for strength, oxidation resistance, and durability. Learn about their chemical composition, applications,

• 23/Oct2025

  How to prevent cold cracks in S355J2W welding?

  To prevent cold cracks in S355J2W welding, focus on three "controls": Hydrogen control: Clean surfaces, dry consumables, post-heat hold/PWHT. Cooling rate control: Preheat, moderate heat input, mult

• 23/Oct2025

  What are the common defects in S355J2W welding?

  Cold cracks, porosities, and lack of fusion/penetration are the top defects for S355J2W welding—all closely linked to its alloy characteristics and process control. Preventing them requires pre-weld s

• 23/Oct2025

  Are there any other factors that affect the impact toughness of Q355NH beside...

  Besides temperature, the impact toughness of Q355NH (a weathering steel per GB/T 4171-2008) is strongly influenced by three key factors: chemical composition, microstructure (driven by heat treatment)

• 23/Oct2025

  What are the specific values of impact toughness test temperatures for differ...

  Each Q355NH grade’s impact test temperature is a direct reflection of its intended service environment, with stricter (lower) temperatures assigned to grades used in colder, harsher regions—this ensur

• 23/Oct2025

  How does the impact toughness of Q355NH change with different test temperatures?

  Q355NH’s impact toughness decreases with lower test temperatures, with a sharp drop at its ductile-brittle transition temperature. The specific change pattern is determined by its quality grade (defin

• 23/Oct2025

  Are there any other factors that need to be considered when determining the i...

  Besides the core factors of quality grade (per GB/T 4171-2008) and actual service environment, there are three other critical factors that must be considered when determining Q355NH’s impact toughness