HY 80 / 100 Steels

HY 100 Steel

Specs: MIL-S-21952 T9074-BD-GIB-010/0300
UNS#: K32045

HY 100 is a high yield steel with minimum yield strength of 100 ksi. While many steels offer high yield strength, HY 100 also offers exceptionally high impact strength as well. This combination makes HY 100 unique among steels. This material is used extensively in marine defense and petrochemical applications.

Wieland Diversified is the largest stocking distributor of HY 80 and HY 100 in NorthAmerica; stocking a full line of round stock, while also offering gun drilled tubing.

Certified to the MIL-S-21952 C/D and T9074-BD-GIB-010/0300

HY is also available in ID/OD Tubing up to 22′ length. Contact us with your requirements.

Details

Heat Analysis

• HY 100 was used in the construction of the Seawolf Class nuclear powered fast attack submarines where the design dictated that the craft had to operate at greater depths than previous designs and hence withstand increased hull pressure.
• In addition, the alloy had to have a high degree of toughness and impact strength to withstand the massive changes in pressure and has excellent fabrication properties to allow the welding of complex structures.
• The alloy has high strength, a minimum of 100ksi proof stress, which is obtained by a water quench and aging heat treatment.
• This low alloy martensitic steel contains small additions of chromium and nickel to help with corrosion resistance and is supplied in the Type B condition bright finish.
• Owing to the rigorous requirements of the end application, all material is electric arc melted and vacuumed degassed with argon. All bar stock is ultrasonically tested to MIL STD 271,(NAVSEA T9074-AS-GIB-010/271) and has full Level I Subsea traceability.
• Wieland Diversified also has the capabilities of supplying gun-drilled tubing.
• The alloy has since found wider applications in the construction of pressure vessels, armor plating, the petrochemical industry, and many other applications requiring greater strength and high integrity material.

Welding

• Weldments of HY-80 are noted for good ductility, notch toughness, and strength. It is recommended to weld using the metal-arc process with low hydrogen electrodes of Type E-10018 or E-11018. It is important to use approved weld procedures, so that the correct heat input per inch of weld bead is introduced, which would otherwise cause degradation of notch toughness. Electrodes should be warmed before use to drive off any moisture to avoid hydrogen pick-up in the weld. Preheating is not required, except for very heavy section thickness welds or heavily constrained welds. Post-heating is not required but a stress relief anneal, after welding of sections of 1-1/2″ thick or greater, is desirable. However, the alloy may be used in the as-welded condition.

Tubing

• High-pressure tubing can be made from HY 100 and HY 80 bars up to 30 feet in length. Tubes can be welded together to achieve longer lengths. The material’s superior combination of ductility and fracture toughness makes it a great choice for pressures as high as 14,000 PSIG operating pressure or more depending on wall thickness. The tubes have been tested up to 21,000 PSGI. Typical operating temperatures are 500o F to -20o F. The tubes can be bent up to 180 degrees with a maximum allowable thinning of 10% and flattening of 8% depending on tube OD and wall thickness and will maintain their physical properties. ID surface finishes of 64 micro or greater can be achieved. Straightness tolerances of .015″ per foot can be maintained. Bars can be ultrasonically tested in immersion and/or Mag Particle tested to ensure integrity after drilling.

Fracture Toughness

• High Strength HY100 steel has a well-documented history in pressure vessel applications, particularly in Submarine hull construction.   
• Under arduous working conditions the steel has to have excellent low cycle fatigue properties and in conjunction with high resistance to crack propagation.
• Recent work conducted by Wieland Diversified on 3.5” solid bar stock has confirmed the excellent fracture toughness properties of HY 100
• Tests were performed to ASTM E 1820 C(T) geometry and C-R orientation at a temperature of 73ºc in air.

Typical graph:

Initiation toughness values J1c ranged from 1341-1999 lbf-in/in
With Fracture toughness KJ1c values ranging from 210-257 ksi√2

These were taken from bars with a range of mechanical properties

Available Shapes – round

Tools

Related Products

Applications

HY 100 Steel Applications

• Pressure vessels
• Submarine construction
• Naval Craft construction
• Heavy construction equipment
• Armor plate for vehicles
• Bank trucks
• Guard Booths and barriers
• Storage tanks for liquefied hydrocarbon vapors
• Petrochemical
• Helicopter hold down rasters