Haynes 230(Ni-Cr-W-Co-Mo)

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1. Introduce

– Alloy with high temperature strength, excellent resistance to oxidizing environments up to 1149°C, resistance to nitriding environments, and good thermal stability

– Lower thermal expansion characteristics than most high-temperature alloys and better resistance to grain coarsening with prolonged exposure to high temperatures

– UNS N06230

* UNS

Abbreviation for Unified Numbering Systems for Metals and Alloys
Unified unique numbering system for metals and alloys
A representative number that is compatible with metals and alloys defined in many material-related codes such as ASTM, AISI, ASME, AWS, etc.

* N : Nickel and nickel alloys

* UNS N06230 : 06XXX : Chromium(Hastelloy, Inconel and some with additional element)

* Haynes

– Alloys designed for high temperature strength, thermal fatigue resistance, oxidation resistance, and corrosion resistance

– Alloys composed mainly of Ni, Cr, Co with elements such as W, Mo, Fe, etc.

2. Property

– Contains high amounts of Cr and W elements

– Lower coefficient of thermal expansion than most high temperature alloys, slow grain growth at high temperature
→ High temperature strength, oxidation resistance, good thermal stability for a long time

Element	Impact
Ni	Provides corrosion resistance
Cr	Provides corrosion resistance, oxidation resistance, creep resistance → Cr+C : M₂₃C₆ carbide formation, carbide precipitation at grain boundaries, creep
Mo, W	Highly strengthening elements, high temperature stability, high temperature creep properties → M₆C carbide formation, provides high temperature stability
Co	Provides strength, creep characteristics

[Haynes 230 Chemical Composition (%)]

Ni	Cr	Fe	C	Al
47.48 ~ 65.39	20.00 ~ 24.00	Max. 3.00	0.05 ~ 0.15	Max. 0.50

Si	Mn	Mo	S	Co
0.25 ~ 0.75	0.30 ~ 1.00	1.00 ~ 3.00	Max. 0.02	Max. 5.00

W	P	B	La
13.00 ~ 15.00	Max. 0.03	Max. 0.02	0.01 ~ 0.05

[Haynes 230 Mechanical Properties]

Tensile Strength (Mpa)	Yield Strength (Mpa)	Elongation (%)
Min. 760	Min. 310	Min. 40

[Haynes 230 Physical Properties]

Density (g/cm³)	Melting Range (℃)	Specific Heat (0-100℃), *J/kg℃**
9.05	1300 ~ 1374	397

3. Standard & Specification

– Specification : UNS N06230

Product Form	AMS	ASTM	AWS
Sheet, Plate, Strip	5878, SB435	B435	–
Billet, Bar, Rod	5891, SB572, B472	B572	–
Coated Electrodes	–	–	AWS A5.11 (ENiCrWMo-1)
Welding Rod, Wire	5839	–	A5.14 (ERNiCrWMo-1)
Pipes, Tubes	SB622, SB619, SB626	B619, B622, B626	–
Forgings	5891, SB564	B564	–

4. Available Form

– Sheet, Plate, Strip

– Billet, Bar, Rod

– Coated Electrodes

– Welding Rod, Wire

– Pipe, Tube

– Forgings

5. Application & Product

– Aerospace, Chemical

Application	Product
Aerospace	Fuel cans, Transition ducts, Flame holders, Thermocouple covers
Chemical	Thermocouple protection tubes, Heat exchangers, Ducts, High temperature bellows