UNS S15500 High End Refractory Alloys Good Toughness For Engine Parts

UNS S15500 (15-5PH, W.Nr. 1.4545)semi-product for engine parts, aircraft components, nuclear reactor components

1 PRODUCT

UNS S15500 (15-5PH, W.Nr. 1.4545)semi-product for engine parts, aircraft components, nuclear reactor components etc.

S15500 is available in following standard semi-finished forms:

Sheet and plate

Delivery condition: Hot or cold rolled, heat treated, descaled or pickled

Strip

Delivery condition: Cold rolled, heat treated, pickled or bright annealed

Bar and Rod

Delivery condition: Forged, rolled, drawn, heat treated, oxidized, descaled or pickled, turned, peeled, ground or polished

Shape and profile

Rolled and extruded, cold drawn, oxidized, descaled or pickled

Wire (profile, round, flats, square)

Delivery condition: Drawn bright, ¼ hard to hard, bright annealed in rings, containers, on spools and headstocks

Wire rod

Delivery condition: hot rolled (dia.5.5mm to 40mm)

Others

Other shapes and dimensions such as discs, rings, seamless pipes, fasteners and forgings can be requested.

2 EQUIVALENT DESIGNATION

XM-12, W.Nr. 1.4545, 05Cr15Ni5Cu4Nb(GB/T), 15-5PH®, ATI 15-5™

3 OVERVIEW

S15500 stainless steel is a martensitic precipitation hardening stainless steel that provides an outstanding combination of high strength, good corrosion resistance, good mechanical properties at temperatures up to 600°F (316°C) and good toughness in both the longitudinal and transverse directions in both base metal and welds.

Short-time, low-temperature heat treatments minimize distortion and scaling.

This alloy is air melted and AOD refined.

4 APPLICATION

S15500 is widely used in the aerospace, chemical, petrochemical, food processing, paper and general metalworking industries.

S15500 is used in applications that require high transverse strength and toughness such as engine parts, aircraft components, nuclear reactor components etc.

5 CHEMICAL COMPOSITION (wt%):

6 PHYSICAL PROPERTY

7 MECHANICAL PROPERTIES

S15500 stainless steel provides excellent mechanical properties. For applications requiring high strength and hardness plus corrosion resistance, this alloy is an outstanding choice. In addition, it is more cost effective than many high-nickel, non-ferrous alloys.

Table 5-1 Typical mechanical properties of S15500 as per AMS 5659

8 CORROSION RESISTANCE

The general level of corrosion resistance of S15500 stainless steel exceeds that of Types 410 and 431, and is approximately equal to that of S17400 stainless steel. This is indicated by laboratory tests in both strongly oxidizing and reducing media, as well as by atmospheric exposures. In all heat-treated conditions, this alloy exhibits very little rusting after 500 hours exposure to 5% salt fog at 95°F (35°C).

When exposed to seacoast atmospheres for long periods of time, the material gradually develops a superficial layer of rust like other precipitation-hardening stainless steels. The general level of corrosion resistance is best in the fully hardened condition, and decreases slightly as the aging temperature is increased.

9 WORKING INSTRUCTION

Formability

The tensile data for the S15500 indicate that the alloy does not possess the high tensile elongation characteristic of the austenitic stainless steels. The material is capable of being mildly formed but is not capable of being severely formed. Forming is more easily accomplished in the overaged condition (such as H1150), as opposed to the annealed condition. A less dramatic downward shift in strength results from excessively long precipitation hardening times. For maximum softness to provide the best machinability and formability, a two-step “1400 + 1150” heat treatment may be used. This treatment, as described in ASTM Standard A693, involves a 2-hour exposure at 1400±15°F (760 ± 8°C), air cooling, a subsequent 4-hour exposure at 1150 ± 15°F (621 ± 8°C), and final air cooling.

Weldability

The precipitation hardening class of stainless steels is generally considered to be weldable by the common fusion and resistance techniques. Preheating is not usually required. Postweld heat treating is needed to produce the various precipitation hardened heat treatment properties. Special consideration is required to achieve optimum mechanical properties by considering the best heat-treated conditions in which to weld and which heat treatments should follow welding. This particular alloy is generally considered to have equivalent weldability to the most common alloy of this stainless class, S17400 stainless steel.

Heat treatment

As supplied from the Mill in Condition A, S15500 stainless steel can be heat treated at a variety of temperatures to develop a wide range of properties. Eight standard heat treatments have been developed. The following table outlines the times and temperatures required.

Condition A Solution Treated at 1900°F ± 25°F (1038°C ± 14°C) or Air cool below 90°F (32°C).

10 STANDARD SPECIFICATION

AMS 5659 Steel, Corrosion Resistant, Bars, Wire, Forgings, Rings and Extrusions 15Cr - 4.5Ni - 0.30Cb (Nb) - 3.5Cu (Composition similar to UNS S15500)

AMS 5826 Welding wire

AMS 5862 Steel, Corrosion resistant sheet, strip, and plate, 15Cr - 4.5Ni - 0.30Cb (Nb) - 3.5Cu, consumable electrode remelted, solution heat treated, precipitation hardenable

AMS H-6875 Heat treatment of steel raw material

ASTM A484 / ASME SA484 General Requirements for Stainless Steel Bars, Billets and Forgings

ASTM A564 Hot rolled and cold finished age hardening stainless steel bar and shapes

ASTM A693 Precipitation hardening stainless and heat resisting steel plate, sheet and strip

ASTM A705 / ASME SA705 Age hardening stainless steel forgings

11 COMPETITIVE ADVANTAGE:

(1) More than 50 years experience of research and develop in high temperature alloy, corrosion resistance alloy, precision alloy, refractory alloy, rare metal and precious metal material and products.
(2) 6 state key laboratories and calibration center.
(3) Patented and innovative technologies.

(4) Ultra-purity smelting process: VIM + IG-ESR + VAR

(5) Excellent high performance.

12 BUSINESS TERM

With background of more than 50 years of material R&D experience, CMMC is a high-tech enterprise specialized in production of high temperature alloys, corrosion resistant alloys, precision alloys, wear resistant alloys, refractory alloys and other special alloys.

With main smelting equipments by CONSARC, including vacuum induction melting furnace (VIM 3 metric tons x 1 set), inert gas protective electric slag remelting furnace (IG-ESR 5 metric tons x 1 set, 10 metric tons x 2 sets), vacuum arc remelting furnace (VAR 10 metric tons x 1 set), CMMC has an annual production capacity of 3000 metric tons.

Established in 2016, CMMC stll having an investing plan of more than 30 million U.S.Dollars in the coming 5 years. CMMC aspires to become an internationally renowned supplier and leading brand of key materials for core components of high-end equipments in the application fields of aerospace, clean energy, petroleum, chemical engineering, medical, marine engineering, food and automobile, etc.

Our main products include forgings, bars, rods, tubulars, plates, sheets, strips, wire rods, precision wires, etc.

From ultra-pure smelting, hot and cold forming, heat treatment, mechanical processing to finish machining, CMMC provides the whole process of one-stop professional services.

From demand idea to research and development, from technology innovation to promoting of products upgrading, from customer's puzzles and difficulties to final solution, from smelting to market, no matter wherever, whenever, whatever and however, CMMC always try to provide satisfactory one-stop service.

By providing better materials to make a better world, CMMC never give up the dream.