HY 80 steel
OTAI SPECIAL STEEL is HY-80 steel stockholders and suppliers from China. more than 26 years of experience in steel round bar, flat bar and plate supply.
HY-80 steel is a high-tensile, high yield strength, low alloy steel. It was developed for use in naval applications, specifically the development of pressure hulls for the US nuclear submarine program and is still currently used in many naval applications. It is valued for its strength to weight ratio.
Form of Supply
HY 80 steel, we can supply the round bar, steel flat bar, plate, hexagonal steel bar and steel square block. Steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces. Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.
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- Round
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- sheet
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- Square
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- Plate
Chemical composition
| C(％) | 0.13–0.18 | Si(％) | 0.15–0.38 | Mn(％) | 0.10–0.40 | P(％) | ≤0.015 |
| S(％) | ≤0.008 | Cr(％) | 1.50–1.90 | Mo (％) | 0.50–0.65 | Ni(％) | 3.00–3.50 |
Weldability
HY-80 steel can be welded without incident provided proper precautions are taken to avoid potential weldability issues. The fact that HY-80 is a hardenable steel raises concerns over the formation of untempered martensite in both the Fusion Zone (FZ) and the heat affected zone (HAZ). The process of welding can create steep temperature gradients and rapid cooling that are necessary for the formation of untempered martensite, so precautions must be taken to avoid this.
Further complicating the weldability issue is the general application of HY-80 steels in thick plate or large weldments for naval use. These thick plates, large weldments and rigorous service environment all pose additional risks due to both intrinsic and extrinsic stress concentration at the weld joint.
HY-80 steel is a member of the low carbon, low alloy family of steels with nickel, chromium and molybdenum (Ni-Cr-Mo) as alloying elements and is hardenable. The weldability of the steel is good, though it does come with a set of challenges due to the carbon and alloy content.
The carbon content can range from 0.12 to 0.20 wt% with an overall alloy content of up to 8 wt%. It is also used extensively in military/navy applications with large thick plate sections that add to the potential weldability problems e.g. ease of heat treatment and residual stresses in thick plate.
The primary objective during the development of the HY-grades of steel was to create a class of steels that provide excellent yield strength and overall toughness, which is accomplished in part by quenching and tempering. The steel is first heat treated at 900 degrees Celsius to austenitize the material before it is quenched. The rapid cooling of the quenching process produces a very hard microstructure in the form of martensite. Martensite is not desirable and thus it is necessary for the material to be tempered at approximately 650 degrees Celsius to reduce the overall hardness and form tempered martensite/bainite.
Contact our experienced sales team to help you with your HY 80 steel questions and inquiry by Email or telephone. The questions will be replied in 24 hours.
Email: jack@otaisteel.com
Tel: +86 769 2319 0193
Fax: +86-769-88705839