Inconel 625 BS 3076 - Standard Specification for Non Ferrous Bolts, Hex Cap Screws and Stud Bolts for General Application.

This British Standard specifies requirements for nickel and nickel alloys in the form of:
(a) hot-worked round bar over 12 mm up to and inclu- ding 300 mm diameter,
(b) cold-worked round bar over 8 mm up to and inclu- ding 55 mm diameter, and
(c) cold-worked square, rectangular and hexagonal bar over 6 mm up to and including 55 mm wide across flats.

Chemical composition of NA21 nickel- chromium-molybdenum-niobium alloy

Element	Min	Max
	%	%
Carbon	---	0.10
Manganese	---	0.50
Silicon	---	0.50
Phosphorus	---	0.015
Sulphur	---	0.015
Chromium	20.0	23.0
Niobium and tantalum	3.15	4.15
Cobalt (if determined)	---	1.0
Molybdenum	8.0	10.0
Iron	---	5.0
Aluminium	---	0.40
Titanium	---	0.40
Nickel	58.0	---

Tensile properties of NA21 nickel-chromium-molybdenum-niobium alloy at room temperature

Condition	Size		0.2 % proof stress min.	1.0 % proof stress min.	Tensile strength min.	Elongation on gauge length of 5.65/ So min.
Condition	Over	Up to and including	0.2 % proof stress min.	1.0 % proof stress min.	Tensile strength min.	Elongation on gauge length of 5.65/ So min.
Cold worked and annealed Hot worked and annealed	mm	mm	N/mm ²(=MPa)	N/mm ²(=MPa)	N/mm ²(=MPa)	%
Cold worked and annealed Hot worked and annealed	---	100	415	455	830	30
Hot worked and annealed	100	---	345	385	760	25
Cold worked and solution, annealed , Hot worked and solution annealed	All sizes		275	---	690	30