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…

The core requirements for grinding after welding include ensuring the weld surface is smooth and flat, removing slag and defects, controlling the base metal removal amount to no more than 5% of the thickness or 0.2mm, aligning the grinding texture with the weld direction, and adjusting specific operations according to the welding type (e.g., thermit welding) and material (e.g., stainless steel). Main Purposes of Grinding After Welding Eliminate Surface Defects: Remove slag, spatter, porosity, undercut, and other flaws to prevent…

As one of the most commonly used non-alloy structural steels in the EN 10025-2 standard, S235JR occupies an important position in fields such as building structures, bridges, machinery manufacturing, petrochemicals, and transmission pipelines due to its stable mechanical properties, good weldability, and wide processing adaptability. For purchasers, selecting the most suitable S235JR material among different product forms is a key issue related to cost, quality, and safety. This article will comprehensively analyze the S235JR product system from four dimensions: performance…

The presence of shielding gas acts like an invisible barrier, blocking the intrusion of oxygen and moisture from the air into the weld seam. If the barrier is stable, an oxide film will not easily form on the metal surface, the purity of the weld pool will be improved, and ultimately the strength and appearance of the weld seam will be more reliable. There are many factors involved, but the core lies in three key aspects: gas type, gas purity…

In structural steel procurement, S235JR is one of the most widely used non-alloy structural steels due to its stable performance and excellent processability. It is commonly applied in steel structures, mechanical components, infrastructure, and pipe systems. However, different projects have different requirements for strength, ductility, and safety factors. Therefore, customers' most frequent questions usually include: What is the S235JR tensile strength? Does the S235JR yield strength meet the project requirements? Do the S235JR mechanical properties vary with thickness? How does the…

Vacuum heat treatment refers to a heat-treating process in which the workpiece is heated to the required temperature in a vacuum atmosphere of 10⁻¹~10⁻² Pa, followed by cooling in different media using different methods. Vacuum heat treatment is recognized in the modern heat-treatment industry as an efficient, energy-saving, and pollution-free clean heat-treatment technology. Parts treated by vacuum heat treatment feature no oxidation, no decarburization, degassing, degreasing, excellent surface quality, minimal deformation, high comprehensive mechanical properties, and stable reliability. Therefore, vacuum…

In the fields of steel structures, pressure components, bridge engineering, and pipeline manufacturing, engineers often need to choose among S235JR, S275JR, S355JR, and Q235, four commonly used structural steels. However, different projects have different requirements for strength, weldability, impact toughness, and cost. So which grade is the most reliable choice? This article analyzes the topic from five dimensions: standards, chemical & mechanical properties, testing methods, application scenarios, and procurement risk control—helping you clearly determine which steel grade best fits your…