Alloy X-750, UNS N07750 forging, bar, plate, tube, bolts etc, high-end specialty alloys R&D and manufacturer

PRODUCT

Alloy X-750, UNS N07750 forgings, bars, plates, tubes, springs, bolts etc for aerospace etc.

EQUIVALENT DESIGNATIONS

GH4145, Inconel® X-750, NiCr17Fe7TiAl(EN), Haynes® X-750 alloy, VDM® Alloy X-750, (Nicrofer 7016 TiNb), W.Nr.2.4669(DIN), NiCr15Fe7TiAl(DIN), NiCr15Fe7Ti2Al(ISO), NC15TNbA(AFNOR)

PRODUCT FORMS

Available product are sheet, strip, plate, round bar, flat bar, forging, forging stock, hexagon, wire, tubing, extruded section, springs and fasteners, etc.

It can be delivered in the solution treated or precipitation hardened condition.

APPLICATION

The economics of alloy X-750 coupled with its availability in all standard mill forms has resulted in applications in a wide variety of industrial fields. In gas turbines, it is used for rotor blades and wheels, bolts, and other structural members. Alloy X-750 is used extensively in rocket-engine thrust chambers. Airframe applications include thrust reversers and hot-air ducting systems. Large pressure vessels are formed from alloy X-750.

Other applications are heat-treating fixtures, forming tools, extrusion dies, and test machine grips. For springs and fasteners, alloy X-750 is used from sub-zero to 1200°F.

CHEMICAL COMPOSITION

OVERVIEW

Alloy X-750 is a precipitation-hardenable nickel-chromium alloy used for its corrosion and oxidation resistance and high strength at temperatures to 1300°F. Although much of the effect of precipitation hardening is lost with increasing temperature over 1300°F, heat-treated material has useful strength up to 1800°F. Alloy X-750 also has excellent properties down to cryogenic temperatures.

Alloy X-750 Characterized by:

● high tensile strength up to 705°C (1300°F)

● high creep and rupture strength up to 820 °C (1500 °F)

● high oxidation resistance up to 980 °C (1800 °F)

● excellent mechanical properties in cryogenic environments

● good corrosion resistance at high and low temperatures and high resistance to stress corrosion cracking

● good weldability by resistance and fusion processes

PHYSICAL PROPERTIES

Density: 8.28 g/cm³

Melting Range: 1395-1430°C

HEAT TREATMENT

Applicable heat treatments for Alloy X-750 product forms

MECHANICAL PROPERTIES

Rods, bars and forgings

Intermediate temperature Service (below 1100°F) – equalized plus precipitation treated material

For applications requiring high strength and ductility at service temperatures up to 1100°F, INCONEL alloy X-750 rod, bar, and forgings are given the following heat treatment:

1625°F/24 hr, A.C. – Equalizing

1300°F/20 hr, A.C. – Precipitation Heat Treatment

This heat treatment is described by AMS 5667, which requires that material so heat-treated have the following minimum room-temperature properties. Hardness will lie in the range of 302-363 BHN.

CORROSION RESISTANCE

Alloy X-750 is resistant to a wide variety of industrial corrosives under both oxidizing and reducing conditions. It resists oxidation and attack by other high-temperature corrosion mechanisms.

In hot corrosion tests for automotive applications, weight loss after exposure for 100 hours in 90% Na₂SO₄ +10% NaCl mixture in air was about 5%. Samples precoated with sodium chloride (by dipping in a hot saturated salt solution), suspended in a furnace at 1700°F and exposed for 100 hr to a moving gas stream of air containing 1% SO₂ exhibited a corrosion penetration of approximately 0.007 in. An interesting feature of this alloy is its high resistance to chloride-ion stress-corrosion cracking even in the fully precipitation-hardened condition. Standard U-bend specimens of precipitation-hardened material (hardness, 33 R_c) showed no signs of cracking when exposed to boiling 42% magnesium chloride for 30 days.

HOT FORMING

Sufficiently powerful equipment is important when hot-forming alloy X-750 because of its resistance to deformation.

The recommended temperature range for hot working alloy X-750 is 980 to 1200 °C (1800-2200°F) range. Cooling should be by water quenching or as fast as possible. Localized reheating is not recommended. Annealing after hot working is recommended to ensure maximum corrosion resistance. For hot working, the material may be charged into the furnace at maximum working temperature.

COLD FORMING

Cold working should be carried out on solution-annealed material. Alloy X-750 has a much higher work-hardening rate than austenitic stainless steel and the forming equipment must be designed accordingly.

When cold working is performed, interstage annealing may become necessary.

MACHINING

Alloy X-750 is machined at practical and economical rates. Proper procedures, tooling, and conditions shall be taken. Because of precipitation-hardened alloy X-750’s high strength and hardness, rough machining is usually done before precipitation hardening. Finish machining then follows precipitation treating. Precipitation hardening relieves machining stresses; therefore, allowance must be made for possible warpage. A slight permanent contraction takes place during precipitation treating, but precipitation-treated material has good dimensional stability. Accurate dimensions and a good finish will result from following these practices.

STANDARD SPECIFICATION

Rod, Bar and Forging Stock

ASTM B637/ASME SB637

ISO 9723 / ISO 9724 / ISO 9725

SAE AMS 5667 / SAE AMS 5668 / SAE AMS 5669 / SAE AMS 5670 / SAE AMS 5671 / SAE AMS 5741 / SAE AMS 5747 / SAE AMS 5749

EN 10269

Plate, Sheet and Strip

ISO 6208

SAE AMS 5542 / SAE AMS 5598

Wire

BS HR 505

SAE AMS 5698

SAE AMS 5699

Seamless tube

SAE AMS 5582

Bare welding rods & wire

SAE AMS 5778

SFA 5.14/ A 5.14 (ERNiCrFe-8)

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) Hundreds of patent technologies.
(4) Ultra-purity smelting process VIM + IG-ESR + VAR.

(5) High performance material.

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.