Exhaust Valves High Performance Alloys , Iron Nickel Base Alloy Corrosion Resistance

Alloy 3015 (3015 alloy) for high power internal combustion engine exhaust valves

PRODUCT

Alloy 3015 (3015 alloy) for high power internal combustion engine (diesel engine and gasoline engine) exhaust valves for automobile, locomotive, tractor, ship, tank, oil rig, construction machinery and mobile power station, etc. Also could be for high strength fasteners at elevated temperatures.

EQUIVALENT DESIGNATION

UNS S66315, CarTech^® NCF 3015 Alloy

PRODUCT FORM

Alloy 3015 is available in forms of bar, rod, strip, forging, forging block, etc.

APPLICATION

Because of its excellent strength and corrosion resistance at elevated temperatures, Alloy 3015 could be considered for engine valve applications, and also could be considered as a replacement for nickel-base super alloys in applications involving the need for strength at elevated temperatures such as fasteners.

OVERVIEW

Alloy 3015 is a precipitation hardenable, iron-nickel base alloy with mechanical properties between those of the iron-base and the more costly nickel-base alloys that have been used for engine valve applications. The alloy was designed for high strength and corrosion resistance up to 1400°F(760°C).

SKETCH OF EXHAUST VALVE

PRODUCTION PROCEDURE OF EXHAUST VALVE

Blanking → Electric heating upsetting forging of head blank → Heat treatment of head blank and rod → Friction welding → Rough turning or grinding → Finish turning → Cut fixed length → Semi-fine grinding the stem → The valve stem chrome plating → Fine grinding the stem → NDT of the finished valve → Delivery

SURFACE CONDITION OF EXHAUST VALVE

PRODUCTION SITE OF EXHAUST VALVE

CHEMICAL COMPOSITION (wt%):

PHYSICAL PROPERTY

Density: 0.2840 lb/in³ (7.88g/cm³)

Melting range: 2400 - 2550°F (1316 - 1399°C)

Electric resistivity: 643.0 ohm-cir-mil/ft at 72°F (22°C)

Magnetic permeability: 1.0170Mu at 200 oersted (15.9 kA/m)

Mean coefficient of thermal expansion

Modulus of elasticity

MECHANICAL PROPERTIES

(1) Charpy V notch impact strength

Tests on 0.625"(16mm) round bar, heat treatment 1922°F(1050°C) / 0.5 hour / oil quench + 1382°F(750°C) / 4 hours / AC

(2) Elevated temperature stress rupture properties

Tests on 0.625"(16mm) round bar, heat treatment 1922°F(1050°C) / 0.5 hour / oil quench + 1382°F(750°C) / 4 hours / AC

(3) Hardness vs. Temperature

Tests on 0.625"(16mm) round bar, heat treatment 1922°F(1050°C) / 0.5 hour / oil quench + 1382°F(750°C) / 4 hours / AC

(4) Tensile strength

Tests on 0.625"(16mm) round bar, heat treatment 1922°F(1050°C) / 0.5 hour / oil quench + 1382°F(750°C) / 4 hours / AC

WORKING INSTRUCTION

Hot working

Alloy 3015 can be forged within the temperature range of 1700/2000°F (927/1093°C). Careful control of the hot working temperature and frictional heat buildup is necessary to avoid hot shortness above 2000°F (1093°C). Alloy 3015 is significantly less resistant to deformation at 1700/2000°F (927/1093°C) than nickel-base Alloy 751.

Cold working

Because of higher ductility and lower tensile or compressive strength, the cold workability of Alloy 3015 is better than that of precipitation hardenable nickel-base alloys like Alloy A-286, it is stiffer than austenitic stainless steels and work hardens rapidly.

Solution treatment

Heat to 1922°F (1050°C), hold at temperature for a minimum of 30 minutes, then oil quench.

Age treatment

Reheat to 1382°F (750°C), hold at temperature for 4 hours, then air cool.

Grinding and Polishing

The grinding characteristics of Alloy 3015 are similar to those of alloy 751.

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) Patent technologies.

(4) Average grain size 9 or finer.

(5) High performance

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.