Question 1: What material is S275JR made of?
S275JR is a European standard steel grade, belonging to carbon structural steel, generally delivered without heat treatment, and belongs to non-alloy structural steel steel pipe. It is mainly composed of iron, carbon, manganese, silicon and other elements, with a low carbon content, which is conducive to improving the plasticity and toughness of steel.
Question 2: What material is S275JR steel pipe equivalent to in China?
S275JR is equivalent to the domestic standard Q295 steel. Q295 is a low-alloy high-strength structural steel with excellent plasticity, welding performance and impact toughness. At the same time, its cold and hot processing performance and low and medium temperature performance are also excellent, and it has certain corrosion resistance.
Question 3: What are the chemical compositions of S275JR steel pipe?
Its chemical composition mainly includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P) and other elements, and the content varies according to the thickness of the steel plate. Taking the thickness of ≤40mm as an example, the carbon content is about 0.21% (some data indicate that the content is less than 0.2% or ≤0.23%); the silicon content is about 0.30% (some data indicate that the content is about 0.15% - 0.45% or 0.4%); the manganese content is about 1.50% (some data indicate that the content is about 1.6% - 3.5%); the phosphorus content is about 0.045% (some data indicate that the content is less than 0.03% or ≤0.045%).
Question 4: What are the mechanical properties of S275JR steel pipe?
Tensile strength: Excellent performance, usually between 410 - 560MPa (some data indicate that it is 430 - 580MPa, or even 785MPa), which means that the maximum stress that the material can resist fracture when subjected to tensile force is higher.
Yield strength: between 270MPa and 275MPa (some data indicate that the yield point is not less than 590MPa, but this data may differ from the conventional understanding, because 275MPa is the minimum yield strength of S275JR), which is an important indicator for measuring the bearing capacity of materials.
Elongation: generally greater than or equal to 21% (some data indicate that the elongation range is 21% to 26%, or the minimum elongation at break is 23%), reflecting the plastic properties of the material.
Impact toughness: usually greater than or equal to 47J/cm² (some data indicate 27J), indicating that the material can absorb a large amount of energy when impacted and has good impact resistance
Question 5: What are the application areas of S275JR steel pipes?
Vehicle manufacturing: can be used to manufacture stamping parts for vehicles, such as car bodies, truck frames, etc.
Building structures: suitable for building structural parts, such as beams, columns, plates, etc.
Chemical equipment: can be used to manufacture medium and low pressure chemical containers and low pressure boiler drums.
Pipeline engineering: suitable for oil pipelines, oil storage tanks, etc.
Other fields: also widely used in thin plate stamping parts, mechanical parts, etc.
