X70 steel plate is pipeline steel. Pipeline steel belongs to low carbon or ultra-low carbon microalloyed steel, is a product of high technology content and high added value, pipeline steel production has applied almost all the new technological achievements in the field of metallurgy in the past 20 years.
The development trend of pipeline engineering is large pipe diameter, high pressure rich gas transmission, high cold and corrosive service environment, and thick wall formation of submarine pipeline. Therefore, modern pipeline steel has high strength, low Bauschinger effect, high toughness and brittleness resistance, low welding carbon content and good weldability, and resistance to HIC and H2S corrosion.
X70MOS steel, a high-strength, low-alloy (HSLA) steel, is specifically designed for offshore applications where resistance to corrosion and mechanical stresses are paramount. This article delves into the key aspects of X70MOS steel, including its chemical composition, mechanical properties, yield strength, and the standards it adheres to.
1.Chemical Composition:
The X70 steel plate grade is meticulously engineered with a balanced chemical composition to ensure optimal performance in offshore conditions.
| C | Si | Mn | P | S | V+Nb+Ti |
| ≥0.12 | ≥0.45 | ≤1.70 | ≤0.025 | ≤0.015 | ≤0.15 |
2.Properties:
X70 pipeline steel has high strength, high toughness, good weldability, certain HIC and SSC resistance, and improving the grade of pipeline steel can save construction cost.
Yield strength MPa:485-635
Tensile strength MPa yield ratio :570-760 ≥0.93
3.Yield Strength:
As indicated by its designation, X70 steel plate has a nominal yield strength of 70 ksi (or 483 MPa). This high yield strength allows the steel to bear significant loads before undergoing plastic deformation, ensuring the stability and durability of offshore structures. The yield strength is a critical factor in the design of platforms, pipelines, and other components that must resist both internal pressures and external forces.
4.Execution Standards:
The manufacturing and testing of X70 steel plate adhere to rigorous international standards to guarantee its quality and performance. These standards include API 5L (American Petroleum Institute specification for line pipe), which outlines the requirements for seamless and welded steel pipe for transporting petroleum products, including offshore pipelines. Additionally, ISO 3183 (International Organization for Standardization) provides guidelines for the impact testing of steel. These standards ensure that X70 steel plate meets the necessary criteria for safety, reliability, and longevity in offshore applications.
Conclusion:
Steel grade X70 stands as a testament to the advancements in materials science aimed at addressing the unique challenges posed by the offshore environment. With its carefully tailored chemical composition, exceptional mechanical properties, notable yield strength, and adherence to stringent execution standards, X70 steel plate is an indispensable material for the construction of robust and enduring offshore structures. Its ability to withstand harsh marine conditions makes it a preferred choice for ensuring the structural integrity and operational efficiency of offshore infrastructure.
Offshore structures are subjected to severe marine environments that demand high performance and reliability from the materials used in their construction. One such material is steel grade X70MOS, a high-strength, low-alloy (HSLA) steel specifically designed for offshore applications where resistance to corrosion and mechanical stresses are paramount. This article delves into the key aspects of X70 steel plate, including its chemical composition, mechanical properties, yield strength, and the standards it adheres to.
Our factory uses advanced steel making, off-furnace refining, continuous casting and furnace rolling mill four-in-one short-process production line, the comprehensive mechanical properties of the production of steel plates are stable, the performance of the initial test pass rate of 99.3%. The developed high strength and toughness pipeline steel can meet the requirements of modern oil and gas transportation, and its yield strength, low temperature impact toughness and welding performance are excellent.
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