We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
High quality piping products from approved manufacturers.
In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
Over the years, Super Steel Manufacturing Co.,Ltd(SMC) has developed an enviable reputation for project management for the Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical and other heavy industries.
The many years of experience that we have means that there is always someone who has the ability to carry a project forward.
Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
Electric Resistance Welded (ERW) steel pipes are versatile components widely used in engineering applications such as fencing, scaffolding, and line pipes. Available in various grades, wall thicknesses, and diameters, ERW pipes meet diverse industrial demands. This article delves into the key technical requirements of ERW steel pipes, focusing on the comparison between J55 and N80 steel grades.
Yield Strength Comparison
The yield strength of N80 steel is significantly higher than that of J55, with a difference ranging from 173 MPa to 206 MPa.
Elongation Differences
Under similar conditions, N80 steel exhibits greater elongation compared to J55, indicating better ductility.
Energy Absorption Capacity
When tested with the same sample size and orientation, J55-grade materials—including couplings, coupling stock, and semi-finished components—absorb less energy than N80-grade materials.
Different Nondestructive Testing (NDT) Methods
The nondestructive testing methods vary between J55 and N80 materials, reflecting the differences in their structural properties and applications.
Color Coding for Identification
ERW pipes of J55 and N80 grades are differentiated by color coding:
J55 pipes with lengths≥1.8 meters are marked with bright green paint.
N80 pipes are marked with red paint.
Heat Treatment Requirements
J55 steel can be processed according to manufacturer preference or specific order requirements, including normalization (N), normalization and tempering (N & T), or quenching and tempering (Q & T).
N80 steel, however, mandates a full-length heat treatment to ensure consistent performance and quality.
These technical specifications highlight the strengths and appropriate applications of J55 and N80 steel grades, ensuring their effective use in ERW steel pipe production and industrial operations.
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