BS 3076 Specification

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.

Cross-references between the alloy designations in this standard and the UNS designations

BS alloy designation UNS alloy designation
NA11 N02200
NA12 N02201
NA13 N04400
NA14 N06600
NA15 N08800
NA15(H) N08810
NA16 N08825
NA18 N05500
NA20 N07080
NA21 N06625

Dimensional tolerances

Diameter (for round bar). The diameter of hot-worked or cold-worked round bar shall not differ from the specified diameter at any point by more than the appropriate tolerance specified in tables 1 or 2. The tolerance on the diameter of machined round bar shall be t0.8 mm, -0 mm. If necessary localized minor surface defects shall be dressed to a depth not exceeding 3 % of the diameter of the bar.
7.2 Width across flats (for square, rectangular and hex- agonal bar). The width across flats shall not differ from that specified by more than the appropriate tolerance specified in table 3.
7.3 Length. The length shall not differ from that specified by more than the appropriate tolerance given in table 4.
7.4 Straightness. The depth of arc (deviation from straight- ness) shall not exceed the appropriate tolerance specified in table 5.
7.5 Ovality. For round bars, excluding those intended for subsequent forging, measurements of two diameters at right angles of any cross section shall not differ by more than half the total appropriate tolerance specified in tables 1 and 2 (see also 7.1).

Selection of samples for mechanical tests

Selection of samples. All bars other than those intended for forging shall be grouped into batches. One test sample shall be cut from a bar selected from each batch, When tensile tests at elevated temperatures are to be carried out, one test sample shall be cut from each batch, of sufficient length to provide a tensile test piece for each test temperature.
Before test samples are cut they shall be marked to identify them with the batch they represent. Test samples shall be taken from the material as supplied and, except for material ordered in the hot-worked condition and in certain cases

Tolerances on diameter of hot-worked round bar

Diameter Tolerance
Over Up to and including Plus Minus
mm mm mm mm
12 25 0.4 0.4
25 50 0.8 0.4
50 100 1.2 0.8
100 110 3.2 1.6

NOTE. For tolerances on machined round bar of all diameters

Tolerances on diameter of cold-worked round bar

Diameter Alloys NA1 1, NA12 and NA13 Allow NA14, NA15, NA15(H NA16, NA17, NA18 and NA2 Alloy NA20 Alloy NA20 (heat treated and descaled)
Over Up to and including Plus Minus Plus Minus Plus Minus Plus Minus
mm mm mm mm mm mm mm mm mm mm
8.0 12.5 0 0.08 0 0.08 0 0.05 0.025 0.075
12.5 25 0 0.05 0.03 0.05 0 0.08 0.025 0.105
25 50 O 0.08 0.04 0.08 O 0.10 0.025 0.125
50 55 0 0.10 0.05 0.10 0 0.10 0.025 0.125

for alloys NA18 and NA20, shall be tested in that condition. Test samples from hot-worked material shall be appropri- ately heat treated before testing. No tests are required on bar intended for further forging.
Samples for mechanical test from alloys NA18 and NA20 supplied in other than the finally heat-treated condition shall be precipitation treated or solution treated and precipitation treated, as appropriate, using the conditions recommended by the supplier, which shall be within the ranges given in appendix A.

Tolerances on width across flats of square, rectangular or hexagonal bar

Width across flats Tolerance
Over Up to and including Plus Minus
mm mm mm mm
5 25 0 0.08
25 38 0 0.10
38 50 0 0.13
50 55 0 0.15

Tolerances on length of bar

Size Tolerance
Over Up to and including Plus Minus
mm mm mm mm
--- 200 4 0
200 300 7 0

Tolerances on straightness of bar

Size Depth of arc mm in any 500 mm.
Cold-worked round bar All sizes 1
Square, rectangular and hexagonal bar All sizes 1.5
Hot-worked bar All sizes 3

Location of test piece. For bars up to and including 30 mm diameter or width across flats, the test piece shall be machined coaxially from the test sample.
For bars over 30 mm up to and including 75 mm diameter or width across flats, the longitudinal axis of the test piece shall be taken not less than 15 mm from the surface of the test sample.
For bars over 75 mm diameter the test piece shall be taken longitudinally with the axis not less than 15 mm from the surface of the test sample or, at the option of the supplier, shall be taken in the transverse direction.

Mechanical tests

Tensile test. For the tensile test, test pieces shall be prepared and the test carried out in accordance with the requirements of BS 18.
Values of 0.2 % proof stress are normally determined for acceptance purposes, but 1 .O % proof stress values may be determined if required by the purchaser and agreed at the time of the enquiry and order.
Stress-rupture test. When a stress-rupture test is required the test piece shall be prepared and the test carried out in accordance with the requirements of BS 3500 : Part 5.
Impact test. When a Charpy V-notch impact test is required the test piece shall be prepared and the test carried out in accordance with the requirements of BS 131 : Part 2. Retests. If any one of the test pieces first selected fails to pass the mechanical tests, two further samples from the same batch shall be selected for testing, one of which shall be from the bar from which the original test sample was taken, unless that bar has been withdrawn by the supplier. If the test pieces from both these additional samples pass, the batch represented by the test samples shall be deemed to comply with the requirements of this standard. If the test pieces from either of these additional samples fail, the batch represented by these samples shall be deemed not to comply with the requirements of this standard.
Tensile tests at elevated temperatures. If required by the purchaser at the time of the enquiry and order (see item (k) in clause 4), bars in alloys NA1 1, NA12, NA13, NA14, NA1 5, NA1 6 and NA21, all in the annealed condition, and alloy NA15(H) in the solution treated condition, shall be supplied to comply with a minimum 0.2 % or 1 .O % proof stress requirement at one or more specified elevated temperatures. In this case the elevated temperature tensile test pieces selected in accordance with clause 8 shall be prepared, and the tests carried out, in accordance with BS 3688 : Part 1 at the temperature(s) specified by the purchaser.

Test certificate

If required by the order, the supplier shall furnish with the material a certificate detailing the results of the chemical analysis and mechanical tests.

Inspection

Inspection of the material by the purchaser, if required, shall be as agreed between the purchaser and the supplier at the time of the enquiry and order.

Marking

Except as specified in 12.2 and at the option of the supplier, each bar shall be identified and the following information shall be legibly and indelibly marked either along the full length at intervals of not greater than 750 mm or at one end:
(a) the number of this British Standard, ¡.e. BS 3076;
(b) the designation of the material (see section two);
(c) the supplier's name or trade mark;
(d) the batch or cast number.
For small bars that are bundled the information may be stamped on metal or other durable tags, one or more of which shall be securely attached to each bundle.
Any special requirements for marking shall be agreed between the purchaser and the manufacturer.
Any material used for marking shall be free from elements deleterious to the metal.

Chemical composition of NA1 1 nickel

Element Min Max
% %
Nickel (including not more than 2 % cobalt) 99.0 ---
Copper --- 0.25
Iron --- O.40
Carbon --- 0.15
Silicon --- 0.35
Manganese --- 0.35
Magnesium --- 0.20
Titanium --- 0.10
Sulphur --- 0.01

The percentage nickel content shall be determined as the difference between 100 and the sum of the contents of the other elements.

Condition. Material shall be supplied in one of the following conditions as specified by the purchaser

Round bar Square, rectangular and hexagonal bar
Cold worked Cold worked
Cold worked and annealed Cold worked and annealed
Hot worked
Hot worked and annealed
Bar intended for further forging

Tensile properties of NA1 1 nickel 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.
Over Up to and including
mm mm N/mm 2(=MPa) N/mm 2(=MPa) N/mm 2(=MPa) %
Cold worked --- 25 415 --- 550 10
25 55 345 --- 520 14
Cold worked and annealed Hot worked and annealed All sizes 105 130 380 35

Note: Values of 0.2 % proof stress are normally determined for acceptance purposes.

Chemical composition. The chemical composition of the material shall be as given in table 8.

Chemical composition of NA12 low-carbon nickel

Element Min Max
% %
Nickel (including not more than 2 % cobalt) 99.0 ---
Copper --- 0.25
Iron --- O.40
Carbon --- 0.02
Silicon --- 0.35
Manganese --- 0.35
Magnesium --- 0.20
Titanium --- 0.10
Sulphur --- 0.01

The percentage nickel content shall be determined as the difference between 100 and the sum of the contents of the other elements.

Tensile properties of NA12 low-carbon nickel 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.
N/mm 2(=MPa) N/mm 2(=MPa) N/mm 2(=MPa) %
Cold worked and annealed Hot worked and annealed All sizes 70 95 340 35

Chemical composition of NA13 nickel-copper alloy

Element Min Max
% %
Nickel (including not more than 2 % cobalt) 63.0 ---
Copper 28.0 34.0
Iron --- 2.5
Carbon --- 0.3
Silicon --- 0.5
Manganese --- 2.0
Sulphur --- 0.024

The percentage nickel content shall be determined as the difference between 100 and the sum of the contents of the other elements.

Condition.Material shall be supplied in one of the following conditions as specified by the purchaser:

Round bar Square, rectangular and hexagonal bar
Cold worked and annealed Cold worked and annealed
Cold worked and stress relieved Cold worked and stress relieved
Hot worked
Hot worked and annealed
Bar intended for further forging

Tensile properties of NA13 nickel-copper 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.
N/mm 2(=MPa) N/mm 2(=MPa) N/mm 2(=MPa) %
Cold worked and annealed All sizes 170 195 480 35
Cold worked and stress relieved Round bars Upto and including 40 mm dia. 415 --- 600 20
Over 40 mm up to and including 55 mm dia 380 --- 580 20
Square, rectangular and hexagonal bars
All sizes 345 --- 580 20
Hot worked and annealed All sizes 170 195 480 35

NOTE. Values of 0.2 % proof stress are normally determined for acceptance purposes (see 9.1).

Chemical composition of NA14 nickel- chromium-iron alloy

Element Min Max
% %
Nickel (including not more than 2 % cobalt) 72.0 ---
Copper --- 0.5
Chromium 14.0 17.0
Iron 6.0 10.0
Carbon --- 0.15
Silicon --- 0.5
Manganese --- 1.0
Sulphur --- 0.015

Condition. Material shall be supplied in one of the following conditions as specified by the purchaser

Round bar Square, rectangular and hexagonal bar
Cold worked Cold worked
Cold worked and annealed Cold worked and annealed
Hot worked
Hot worked and annealed
Bar intended for further forging

Tensile properties of NA14 nickel-chromium-iron 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.
Over Up to and including
Cold worked and annealed mm mm N/mm 2(=MPa) N/mm 2(=MPa) N/mm 2(=MPa) %
--- 12.5 620 --- 830 7
12.5 25.0 585 --- 760 10
25.0 55.0 550 --- 720 12
Cold worked and annealed Hot worked and annealed All sizes 240 265 550 30

NOTE. Values of 0.2 X proof stress are normally determined For acceptance purposes(see 9.1).

Chemical composition of NA15 and NA15(H) nickel-iron-chromium alloys

Element NA15 NA15(H)
Min Max Min Max
% % % %
Nickel (including not more than 2 % cobalt) 30.0 35.0 30.0 35.0
Copper --- 0.75 --- 0.75
Chromium 19.0 23.0 19.0 23.0
Aluminium 0.15 0.60 0.15 0.60
Carbon --- 0.10 0.05 0.10
Silicon --- 1.0 --- 1.0
Manganese --- 1.5 --- 1.5
Titanium 0.15 0.60 0.15 0.60
Iron Remainder Remainder
Sulphur --- 0.015 --- 0.015

Condition. Material shall be supplied in one of the following conditions:

Round bar Square, rectangular and hexagonal bar
NA15 NA15
Cold worked and annealed Cold worked and annealed
Hot worked
Hot worked and annealed
Bar intended for further forging
NA15(H) NA15(H)
Cold worked and solution treated Cold worked and solution treated
Hot worked and solution treated
Bar intended for further forging

Tensile properties of NA15 and NA15(H) nickel-iron-chromium alloys at room temperature

Alloy Condition Size 0.2 % proof stress min. 1.0 % proof stress min. Tensile strength min. Elongation on gauge length of 5.65/ So min.
N/mm 2(=MPa) N/mm 2(=MPa) N/mm 2(=MPa) %
NA15 Cold worked and annealed.
Hot worked and annealed 		ALl sizes 205 235 520 30
NA15(H) Cold worked and solution treated.
Hot worked and solution treated. 		ALl sizes 170 200 450 30

NOTE. Values of 0.2 % proof stress are normally determined for acceptance purposes.

Chemical composition of NA16 nickel-iron- chromium-molybdenum alloy

Element Min Max
% %
Nickel (including not more than 2 % cobalt) 38.0 46.0
Copper 1.5 3.0
Chromium 19.5 23.5
Molybdenum 2.5 3.5
Aluminium --- 0.05
Silicon --- 0.5
Manganese --- 1.0
Titanium 0.6 1.2
Sulphur --- 0.03
Iron Remainder

NOTE. he titanium content should be at least 20 times the carbon content.

Condition. Material shall be supplied in one of the following conditions as specified by the purchaser:

Round bar Square, rectangular and hexagonal bar
Cold worked and annealed Cold worked and annealed
Hot worked and annealed
Bar intended for further forging

Tensile properties of NA16 nickel-iron- chromium-molybdenum 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.
N/mm 2(=MPa) N/mm 2(=MPa) N/mm 2(=MPa) %
Cold worked and annealed.
Hot worked and annealed 		ALl sizes 220 250 590 30

NOTE. Values of 0.2 % proof stress are normally determined for acceptance purposes (see 9.1).

Chemical composition of NA17 nickel-iron- chromium-silicon alloy

Element Min Max
% %
Nickel (including not more than 2 % cobalt) 34.5 41.0
Copper --- 0.5
Chromium 17.0 19.0
Carbon --- 0.10
Silicon 1.9 2.6
Manganese 0.8 1.5
Titanium --- 0.20
Iron Remainder
Sulphur --- 0.03

Chemical composition of NA18 nickel-copper- aluminium alloy

Element Min Max
% %
Nickel (including not more than 2 % cobalt) 63.0 ---
Copper 27.0 33.0
Iron --- 2.0
Aluminium 2.3 3.2
Carbon --- 0.25
Silicon --- 0.5
Manganese --- 1.5
Titanium 0.35 0.85
Sulphur --- 0.01

The percentage nickel content shall be determined as the difference between 100 and the sum of the contents of the other elements.

Tensile properties of NA18 nickel-copper-aluminium alloy at room temperature

Condition Size 0.2 % proof stress min. Tensile strength min. Elongation on gauge length of 5.65/ So min.
Over Up to and including
Cold worked and precipitation treated mm mm N/mm 2(=MPa) N/mm 2(=MPa) %
--- 25 760 1000 14
25 55 690 970 16
Cold worked, solution treated and precipitation treated --- 25 620 900 20
25 55 585 900 20
Hot worked and precipitation treated --- 110 690 970 15
110 300 550 830 15
Hot worked, solution treated and precipitation treated --- 25 620 900 20
25 110 585 900 20
110 300 500 830 15

NOTE. Values of 0.2 X proof stress are normally determined For acceptance purposes(see 9.1).

Chemical composition of NA20 nickel- chromium-titanium-aluminium alloy

Element Min Max
% %
Nickel (including not more than 2 % cobalt) Remainder
Copper --- 0.2
Chromium 18.0 21.0
Iron --- 1.5
Aluminium 1.0 1.8
Carbon 0.04 0.10
Silicon --- 1.0
Manganese --- 1.0
Titanium 1.8 2.7
Sulphur --- 0.015
Boron --- 0.008

The percentage nickel content shall be determined as the difference between 100 and the sum of the contents of the other elements.

Tensile properties of NA 20 nickel-chromium- titanium-aluminium alloy at room temDerature

Condition Size 0.2 % proof stress min. Tensile strength min. Elongation on gauge length of 5.65/ So min.
N/mm 2(=MPa) N/mm 2(=MPa) %
Cold worked, solution treated, and two-stage precipitation treated ALl sizes 620 1000 20
Hot worked, solution treated, and two-stage precipitation treated ALl sizes 620 1000 20

Stress-rupture properties of NA20 nickel- chromium-titanium-aluminium alloy

Sizes Temperature Stress min. Time to rupture min.
°C N/mm2 h
All 750 325 23

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.
Over Up to and including
Cold worked and annealed
Hot worked and annealed		 mm mm N/mm 2(=MPa) N/mm 2(=MPa) N/mm 2(=MPa) %
--- 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