Mastering the differences in global welding standards is a compulsory course for the industry: European EN standards mandate CE certification, the American AWS system is flexible and practical, and Chinese GB standards are accelerating their integration with international standards. Overview of the European Welding Standard System The European welding standard system is mainly formulated by the Comité Européen de Normalisation (CEN) and closely cooperates with the International Organization for Standardization (ISO) to form the EN ISO series of standards. These standards cover the entire process of…

In bridge, factory, energy, and heavy-load engineering projects, the low-temperature safety of structural steel often determines the long-term reliability of the project. Especially in high-latitude, cold, or areas with significant day-night temperature differences, focusing solely on strength is no longer sufficient. Impact toughness becomes the key indicator that truly affects the structure's ability to resist brittle fracture. This article, written by LONGMA with over 20 years of experience in structural steel pipe production and quality control, systematically analyzes the impact…

In large-scale infrastructure and industrial construction projects, the reliability of structural materials directly determines engineering safety and service life. With increasing bridge spans, higher loads in industrial buildings, and increasingly complex service environments for heavy-load structures, conventional structural steels can no longer meet comprehensive performance requirements. Thanks to its higher yield strength, excellent weldability, and stable low-temperature toughness, S355 high-strength steel has become a mainstream choice in the fields of bridge steel, industrial building steel structures, and heavy-load structural steel. As…

In large-scale steel structures, bridge engineering, pressure vessels, marine equipment, and other projects, welding performance is often more critical than nominal strength in determining the long-term safety of the structure. As a widely used high-strength structural steel in the European EN 10025 system, S355 steel is extensively employed in load-bearing welded structures due to its excellent strength-toughness balance. However, in practical engineering, many quality issues stem not from the material itself but from insufficient understanding of S355's welding performance, welding…

In structural steel selection and engineering procurement, the delivery condition determines the actual performance of the material on site. This article, written by LONGMA with 20+ years of manufacturing and quality-control experience, systematically introduces the performance parameters of S355K2 and S355K2+N, the key differences from S355J2 (s355k2 vs s355j2), and common ASTM equivalent references, helping procurement engineers better control risk and cost. What is S355K2? S355K2 is a non-alloy structural steel defined under EN 10025-2 (Material no. 1.0596). It belongs…

Russian welding seam standards usually adopt the State Standard of the Russian Federation (GOST) or the Technical Regulations of the Russian Federation (FZ). These standards specify requirements for welding processes, welding seam quality, welding materials, welding equipment, welding inspection and testing, etc. It should be noted that specific welding seam standards and requirements may vary by industry and product. Therefore, in practical applications, it is necessary to select applicable standards and requirements according to the actual situation. Overview of the…

In the EN 10025-2 standard system, the S355 series is one of the most widely used structural steels. However, even though they all belong to S355J2, different delivery conditions such as S355J2+N, S355J2+AR, and S355J2M result in significantly different performance and application scenarios. Many buyers focus only on the grade itself while ignoring how heat treatment/delivery conditions affect performance, weldability, impact toughness, and even the final product lifespan. This article analyzes the differences among the three from heat treatment methods,…

In global steel procurement and engineering projects, “S355J2 Equivalent” is one of the most frequently searched technical keywords. Many users also search specifically for: s355j2 equivalent astm、s355j2 us equivalent、s355j2 equivalent indian standard、s355j2 steel equivalent — often because cross-standard material comparison directly affects project safety, procurement compliance, and cost. This article organizes all mainstream equivalents of S355J2 under ASTM, ASME, AISI, EN, GOST, and Indian Standards, and provides detailed comparison tables so buyers can quickly confirm whether S355J2 meets their engineering…

Welding is a common metal joining method, widely used in industrial production and manufacturing processes. During the processing and assembly of welded parts, they usually undergo high-temperature melting and cooling processes. However, the welding process generates enormous heat, leading to an increase in the temperature of welded parts. Since high temperatures may have adverse effects on material properties and structures, such as thermal stress and intergranular corrosion, effective cooling methods must be adopted during welding to ensure welding quality and…

In structural steel procurement and engineering applications, the delivery conditions of S355J0 (+AR, N, +N) directly determine mechanical properties, weldability/formability, and application suitability. As LONGMA, a manufacturer with more than 20 years of steel pipe production and quality control experience, this article analyzes the topic from multiple technical angles—standard definitions, microstructure, mechanical differences, test requirements, and procurement/quality-risk control—so you can make decisions with confidence while maintaining both safety and cost efficiency. What Are Delivery Conditions (+AR / N / +N)?…

AS/NZS 1554 is a joint Australian and New Zealand standard applicable to welding and steel structure-related projects. It covers welding processes, quality control, and personnel certification for materials such as steel structures and aluminum alloys, and is widely used in construction, mining, manufacturing, and other fields to ensure structural safety and compliance. Core Standards and Certification Requirements The AS/NZS 1554 series is the core standard, consisting of several parts: AS/NZS 1554.1: General Welding Structures AS/NZS 1554.2: Welding of High-Strength Steels…

In communications with global customers, we are frequently asked: "What exactly are the differences between S355J0, S355J2, and S355JR?" This is not just a question about material designations, but a key distinction related to structural safety, low-temperature toughness, weldability, and engineering service life. As LONGMA, with over 20 years of experience in steel pipe and structural steel production, we will clarify the core differences between the three based on authoritative standards (EN 10025-2, ASTM A370, ASTM E23) and combined with…

In global steel engineering projects, S355J0 equivalent is one of the most frequently searched technical topics by procurement engineers and design institutes. As a steel pipe manufacturer with 20+ years of production experience, LONGMA fully understands the uncertainties of cross-standard material sourcing. This article provides a complete analysis based on authoritative data, standard clauses, and test evidence to help you accurately determine material equivalence, reduce project risks, and improve procurement efficiency. S355J0 Equivalents in International Standards (Core Comparison Table) The following…

Tungsten Inert Gas (TIG) Welding is an arc welding process that generates heat between a non-consumable electrode and the workpiece. The electrode rod, weld pool, arc, and the heated area adjacent to the workpiece are all shielded by a gaseous medium to prevent atmospheric contamination. This shielding is provided by a single gas or gas mixture, which must offer full protection—even minute air infiltration can contaminate the weld bead. As a non-consumable electrode inert gas shielded welding process, TIG/GTAW operates…

S235JR is one of the most widely used non-alloy structural steels in EN 10025-2. Whether in steel structure construction, pressure pipeline frames, mechanical support manufacturing, or bridge and steel platform assembly, welding is involved in almost every processing stage. Therefore, understanding S235JR weldability, mastering suitable welding electrodes, and developing a scientific process plan are key to ensuring safety and cost-efficiency in engineering projects. This guide analyzes S235JR welding from multiple perspectives—including metallurgical principles, welding risks, filler materials, electrode selection, testing…