K94100 / Invar 42 Nickel Iron Special Alloys For Automotive With Curie Temperature 360℃

Nickel iron alloy 42 (K94100, Invar 42) semi-products for automotive and industrial electric lamp bulbs

1 PRODUCT

Nickel iron alloy 42 (UNS K94100, W.Nr. 1.3917, Invar 42) bar, tube, strip, wire, forging for automotive and industrial electric lamp bulbs.

Alloy 42 is available in following standard semi-finished forms:

Sheet

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

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 and forgings can be requested.

2 EQUIVALENT DESIGNATION

W.Nr. 1.3917, Ni42, FeNi42(AFNOR), Nilo® alloy 42, Invar® 42, 4J42, UNS K94100

3 OVERVIEW

Alloy 42 is a binary nickel-iron alloy containing 42% nickel. It has a low, and nominally constant, coefficient of expansion over the range 20-300°C (85-570°F).

4 APPLICATION

Alloy 42 is used for tooling for aerospace composites, thermostat rods, for semi-conductor lead frames, in thermostatic bi-metal strip, and for metal to glass and ceramic-to-metal sealing applications in microelectronic components, vacuum devices, automotive and industrial electric lamp bulbs, transformer and capacitor bushings.

5 CHEMICAL COMPOSITION (wt%):

6 PHYSICAL PROPERTY

Density at 20°C: 8.11 g/cm³ (0.293lb/in³)

Modulus of elasticity in tension: 21.8 x 10³ ksi (150 x 10³MPa)

Curie temperature: 680°F (360°C)

Table 4-1 Melting and inflection points

Table 4-2 Thermal conductivity at 20°C (68°F)

Table 4-3 Electrical resistivity

Table 4-4 Typical thermal expansion of Alloy 42

Figure 1 Typical thermal expansion of Alloy 36 and Alloy 42.

7 METALLOGRAPHY

In the soft annealed condition, Alloy 42 has a cubic face-centered crystal structure.

8 CORROSION RESISTANCE

Refer to NACE (National Associate of Corrosion Engineers) for recommendations.

9 MECHANICAL PROPERTIES

Table 5-1 Typical mechanical properties of Alloy 42 in annealed condition

Table 5-2 Hardness

10 WORKING INSTRUCTION

Forging

Forging stock should be heated quickly to 2150/2200ºF (1175/1205ºC) and soaked for a short time only to avoid penetration of sulfur and oxygen from the reheat furnace atmosphere. Forging should not be performed below 1700/1800ºF (925/980ºC), but advice should be taken on actual finishing temperatures and their effects on material properties.

Cold Heading

Alloy 42 may be swaged or cold upset.

Heat treatment

Machining

Following are typical machining parameters

Joining

The alloy may be welded using conventional methods.

Three processes are typically used for welding Invar 42 for tooling applications:

◘ Gas Metal Arc Welding (GMAW aka MIG)

◘ Gas Tungsten Arc Welding (GTAW aka TIG)

◘ Submerged Arc welding (SAW)

11 STANDARD SPECIFICATION

ASTM B753 Plate, sheet

DIN 17745 Plate, sheet, bar, rod

SEW 385 Plate, sheet, bar, rod

AFNOR NF A54-301Composition

ASTM F29 Wire

ASTM F30 Sheet, strip, rod, bar, tubing and wire

ASTM F1684 Plate, sheet, bar, rod

MIL-I-23011 CL 5 Plate, sheet

12 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 technologies.

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

(5) Excellent high performance.

13 BUSINESS TERM