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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 including 300 mm diameter,
(b) cold-worked round bar over 8 mm up to and including 55 mm diameter, and
(c) cold-worked square, rectangular and hexagonal bar over 6 mm up to and including 55 mm wide across flats.
| 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 |
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. 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
| 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:
NOTE. For tolerances on machined round bar of all diameters
| 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 appropriately 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.
| 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 |
| Size | Tolerance | ||
|---|---|---|---|
| Over | Up to and including | Plus | Minus |
| mm | mm | mm | mm |
| — | 200 | 4 | 0 |
| 200 | 300 | 7 | 0 |
| 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.
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.
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 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.
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.
| 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 |
| 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.
| 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.
| 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 |
| 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 |
Note:
Values of 0.2 % proof stress are normally determined for acceptance purposes (see 9.1).
| 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 |
| 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).
| 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 |
| 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 foracceptance purposes.
| 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 |
| 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).
| 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 |
| 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).
| 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 |
| 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 |
| Sizes | Temperature | Stress min. | Time to rupture min. |
|---|---|---|---|
| °C | N/mm2 | h | |
| All | 750 | 325 | 23 |
| 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 | — |
| 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 | |