BWC Metals and Alloys

STAINLESS STEEL


Custom 465®1 Stainless Steel

Description -- Custom 465®1 Stainless is a premium quality, high strength, age-hardening stainless alloy designed for improved notch tensile strength, fracture toughness and fabricability. This alloy has excellent resistance to stress corrosion cracking. Stress Corrosion cracking resistance of this alloy in the H 1000 condition is comparable to Carpenter 13-8 stainless in the H 1050 condition.
Attributes
General corrosion resistance similar to Type 304 stainless steel.

    • Stress corrosion cracking resistance equal to Carpenter 13-8 stainless.
    • Strength superior to Custom 455®1 stainless.
    • Notched tensile strength superior to Custom 4551.
    • Fracture toughness equal to Carpenter 13-8 stainless but at a higher strength and superior to Custom 4551

Applications -- Has been used in medical instruments, small turbine engine shafts, sporting equipment and hand guns.

Custom 455®1 Stainless Steel
Description – With good corrosion resistance to atmospheric environments, Custom 4551 Stainless is a martensitic age-hardening stainless steel. This alloy is relatively soft and formable in the annealed condition. A single-step aging treatment develops exceptionally high yield strength with good ductility and toughness.

This stainless can be machined in the annealed condition, and welded in much the same manner as other precipitation hardenable stainless steels. Because of its low work-hardening rate, it can be extensively cold formed. The dimensional change during hardening is only about -0.0001 in/in, which permits close-tolerance finish machining in the annealed state.
Custom 455®1 Stainless should be considered where simplicity of heat treatment, ease of fabrication, high strength and corrosion resistance are required in combinations.

BioDur®1 Type 316LS Stainless Steel
Description -- An electro-slag remelted (ESR) or vacuum arc remelted (VAR), low carbon, high nickel and molybdenum version of Type 316 stainless. The secondary premium melting step (ESR or VAR) imparts improved cleanliness. The chemistry modifications are designed to maximize the corrosion resistance of this alloy and provide a ferrite free microstructure. The alloy is nonmagnetic even after severe cold forming operations.

Applications -- It has found applications in fracture fixations devices such as bone plates, screws, and intramedullary nails. This alloy has also been used as machining and forging stock for producing surgical implant devices, and in surgical instruments where high hardness is not a requirement.

Carpenter L-6051 Alloy Stainless Steel
Description -- A nonmagnetic solid-solution strengthened cobalt base alloy that has good oxidation-corrosion resistance as well as high strength at elevated temperatures. The high strength properties of this alloy may be obtained through work hardening. It remains nonmagnetic in the work hardened condition. Although the aging response of L-605 is considered minimal when compared to typical age hardening alloys, it may be used in the cold worked and aged conditions in certain instances.

Applications -- It has been used for heart valves, bone drill bits, gas turbine rotors, nozzle diaphragm valves, and springs.

Carpenter Stainless Custom 6301Stainless Steel
Description -- Stainless Custom 6301 is a martensitic precipitation/age-hardening stainless steel offering high strength and hardness along with excellent corrosion resistance. It has good fabricating characteristics and can be aged hardened by a single-step, low temperature treatment.

Applications -- It has been used for chemical process equipment, oil field valve parts, aircraft fittings, fasteners, pump shafts, nuclear reactor components, gears, paper mill equipment, missile fittings, and jet engine parts.


TITANIUM


Titanium Alloy Ti 6 Al-4V
Description -- Titanium alloys are generally classified into three main categories: Alpha alloys, which contain neutral alloying elements (such as Tin) and/or alpha stabilizers (such as Aluminum, Oxygen) only and are not heat treatable. Alpha+beta alloys, which generally contain a combination of alpha and beta stabilizers and are heat treatable to various degrees; and beta alloys, which are metastable and contain sufficient beta stabilizers (such as Molybdenum and Vanadium) to completely retain the beta phase upon quenching and can be solution treated and aged to achieve significant increases in strength.

Known as the “workhorse” in the Titanium industry because it is by far the most common titanium alloy, accounting for more than 50% of total titanium usage, Ti 6 Al-4V is an alpha+beta alloy that is heat treatable to achieve moderate increases in strength.

Applications – for use in applications where a combination of high strength at low to moderate temperatures, light weight and excellent corrosion resistance are required, such as medical devices, aircraft turbine engine components, aircraft structural components, aerospace fasteners, high-performance automotive parts, marine applications, and sports equipment.

Titanium Alloy Ti 6 Al-4V ELI
Description – Titanium alloys are generally classified into three main categories: alpha alloys, which contain neutral alloying elements (such as Tin) and/or alpha stabilizers (such as Aluminum, Oxygen) only and are not heat treatable. Alpha+beta alloys, which generally contain a combination of alpha and beta stabilizers and are heat treatable to various degrees; and Beta alloys, which are metastable and contain sufficient beta stabilizers (such as Molybdenum and Vanadium) to completely retain the beta phase upon quenching and can be solution treated and aged to achieve significant increases in strength. Titanium Alloy Ti 6 Al-4V ELI is a higher-purity (“extra-low interstitial”) version of Ti 6 Al-4V, with lower specified limits on iron and the interstitial elements Carbon and Oxygen. It is an alpha+beta alloy. Ti 6 Al-4V ELI has been the material of choice for many medical and dental applications due to its excellent biocompatibility.

Applications – Ti 6 Al-4V ELI may be considered in any biomedical application, particularly implantable components, because of its biocompatibility, good fatigue strength, and low modulus. It could also be considered for any application where a combination of high strength, light weight, good corrosion resistance, and high toughness are required, especially at cryogenic temperatures. Some typical applications include joint replacements, bone fixation devices, surgical clips, and cryogenic vessels. The ELI grade has superior damage tolerance (fracture toughness, fatigue crack growth rate) and better mechanical properties at cryogenic temperatures compared to Ti 6 Al-4V.

NICKEL-COBALT-CHROMIUM-MOLYBDENUM ALLOY


Carpenter MP35N1 Alloy
Description -- Carpenter MP35N1 alloy is a nonmagnetic, nickel-cobalt-chromium-molybdenum alloy possessing a unique combination of ultrahigh tensile strength (up to 300 ksi [2068 MPa]), good ductility and toughness, and excellent corrosion resistance. In addition, this alloy displays exceptional resistance to sulfidation, high temperature oxidation, and hydrogen embrittlement.
The unique properties of MP35N1 alloy are developed through work hardening, phase transformation and aging. If the alloy is used in the fully work hardened condition, service temperatures up to 750°F (399°C) are suggested.

Applications -- Because of its unique combination of properties, MP35N1 alloy has been used in a wide variety of applications. It has been used in fasteners, springs, nonmagnetic electrical components and instrument parts in medical, seawater, oil and gas wells, and chemical and food processing environments.

1 Trademark Carpenter Technology Corp., Reading PA