Some standard content:
National Standard of the People's Republic of China wwW.bzxz.Net
Nickel and nickel-copper alloys round bars
Nickel and nickel-copper alloys round bars This standard applies to nickel and nickel-copper alloy round bars used as important parts in machinery, chemical industry and other 1. Varieties
1.1 Brand, state, specification
The alloy brand, supply state and specification of the product shall comply with the provisions of Table 1. Table 1
Alloy grade
NCu28-2.5 -1.5
NCu40-2-1
1.2 Overall dimensions and allowable deviations
Supply status
Drawing, hard (Y), soft (M)
Extrusion (R)
Drawing, hard (Y), semi-hard (Y2), soft (M) Extrusion (R)
Drawing: hard (Y), soft (M)
Extrusion (R)
1.2.1 The diameter and allowable deviation of the rod are as follows: 1.2.1.1 The diameter and allowable deviation of the drawn rod shall be as specified in Table 2. Table 2
Nominal diameter
5, 5.5, 6
6.5, 7, 7.5, 8, 8.5, 9,
11, 12, 13, 14, 15, 16,
17, 18
National Bureau of Standards 1984-05-29
UDC 669.24 +669
.2453-422
GB4435-84
Specification mm
1985-0501 implementation
Nominal diameter
19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30
32, 34, 35, 36, 38, 40
GB4435—84
Continued Table 2
1.2.1.2 The diameter and allowable deviation of the extruded rod shall be in accordance with the provisions of Table 3. Table 3
32, 34, 35, 36, 38, 40
42, 44, 45, 46, 48, 50, 52, 54, 55, 56, 58, 60
1.2.1.3 The deviation grade of the bar should be indicated in the contract, otherwise it will be supplied as ordinary grade. 1.2.1.4 With the agreement between the supplier and the buyer, bars of other specifications and allowable deviations can be supplied. 1.2.2 The length and allowable deviation of the bar are as follows: 1.2.2.1 The length of the bar is not fixed
The diameter is 5~18mm, the supply length is 1~4m; the diameter is 19~30mm, the supply length is 0.5~3m, the diameter is 32~60mm, the supply length is 0.5~2m. Deviation
1.2.2.2 Fixed length or multiple length
Fixed length or multiple length (agreed in the contract) shall be within the range of variable length, and the length tolerance is +20mm. The multiple length shall include the sawing amount when sawing in sections, and each sawing amount is 5mm. 1.2.3 The bars shall be supplied in straight bars, and the curvature shall comply with the provisions of Table 4. The total curvature of the bars shall not exceed the product of the permissible curvature per meter and the total length (meters).
Bar diameter
Curvature per meter
Not greater than
Manufacturing method
Drawing, extrusion
1.2.4 The ends of the bars shall be sawn flat. For bars with a diameter equal to or less than 15mm, punching and shearing marks are allowed at the ends. 1.3 Marking examples
GB 4435-84
Example 1: The common grade drawn semi-hard state bar with a diameter of 18mm made of NCu28-2.5-1.5 alloy is marked as rod NCu28-2.5-1.5Y2 drawn Φ18GB4435-84 Example 2: The higher grade drawn soft state bar with a diameter of 20mm made of N6 is marked as: rod N6M drawn higher medium 20GB4435-84
2 Technical requirements
2.1 The chemical composition of the bar shall comply with the provisions of N6, NCu28-2.5-1.5 and NCu40-2-1 in YB144-71 "Chemical composition of nickel and nickel alloy products".
2.2 The room temperature longitudinal mechanical properties of the bar shall comply with the provisions of Table 5. Table 5
Alloy grade
NCu28 -2.5 - 1.5
Drawn, hard (Y)
Drawn, soft (M)
Drawn, hard (Y)
Drawn, semi-hard (Y2)
Drawn, soft (M)
20～30
>30～40
≥50~60
5 ~ 15
>15~30
>30～40
>20～30
30～40
Tensile strength (h
kgf/nm
not less than
Elongation on
Alloy grade
NCu28 -2.5 - 1.5
NCu40 - 2 1
Drawing, hard (Y)
Drawing, soft (M)
GB4435—84
Continued Table 5
Tensile strength
kgf/mm
Elongation
2.3 The surface quality of the bars is as follows:
2.3.1 The surface of the drawn bars shall be smooth and clean, and no defects such as cracks, peeling, pores, inclusions, rough drawing, ring marks and green rust are allowed.
It is allowed to have local defects that do not make the bar diameter exceed the allowable deviation. Scratches, pits and spots are allowed. Slight straightening marks, oxidation color and darkening are allowed. 2.3.2 The surface of the extruded rod should not have cracks, bubbles and peeling. Local defects that do not cause the rod diameter to exceed the allowable deviation are allowed. 2.4 The fracture of the rod should be dense and without shrinkage. Porosity, delamination and inclusions that exceed the requirements of YB732-71 "Copper-nickel and its alloy pipes and bars fracture inspection method" are not allowed. 3 Test method
3.1 The arbitration analysis method of the chemical composition of the rod shall be in accordance with YB128-76 "Nickel 3.2 The bar breaking test shall be carried out in accordance with the provisions of YB732-71. 3.3 The room temperature tensile test method of bars shall be carried out in accordance with the provisions of GB228-76 "Metal Tensile Test Method". 3.4 The external dimensions of bars shall be measured by vernier calipers, micrometers, steel rulers, meter rulers, tape measures, etc. Inspection rules
4.1 Bars shall be inspected and accepted by the supplier's technical supervision department, and the product quality shall be guaranteed to meet the requirements of this standard. 4.2 The bars shall be submitted for inspection in batches, and each batch shall consist of the same alloy grade, state and specification. The weight of each batch shall exceed 1000kg. 4.3 The sampling quantity and sampling location shall be specified as follows: 4.3.1 Each batch of bars shall be inspected for external dimensions and surface quality one by one. 4.3.2 The room temperature tensile test shall be conducted by randomly selecting two bars from each batch, and randomly selecting one specimen from each bar. The specimens for the tensile test shall be machined into 5, 8, 10 or 15 mm according to the following provisions, depending on the proximity of the specimen to the diameters of 5, 8, 10 and 15 mm.
For diameters equal to or less than 10mm, no lathing is required;
For diameters greater than 10-24mm, lathing is performed with the center of the cross section of the bar as the center of the circle; 610
GB4435-84
For diameters greater than 24-40mm, lathing is performed within the flat circle area; For diameters greater than 40mm, lathing is performed within the fan-shaped area formed by two mutually perpendicular radii of the cross section of the bar. 4.3.3 The broken door inspection shall be conducted by taking two bars from each batch at random and testing them by pressing the remaining end. 4.4 For each test, even if only two test specimens fail the test results, double test specimens shall be taken from the batch to retest the unqualified item. If there are still one unqualified test specimen after the retest, the entire batch shall be scrapped or tested one by one. The qualified ones shall be individually batched for acceptance. 5 Marking, packaging, transportation, storage
The marking, packaging, transportation and storage of bars shall be carried out in accordance with the provisions of YB730-70 "General Methods for Packaging, Marking, Transportation and Storage of Heavy Nonferrous Metals Processing Products".
Additional Notes:
This standard was proposed by China Nonferrous Metals Industry Corporation. This standard was drafted by Shenyang Nonferrous Metals (Sichuan). The main drafters of this standard are Tan Zhongcheng and Fan Xishu. From the date of implementation of this standard, the former Ministry of Metallurgical Industry Standard YB759-70 "Nickel and Nickel Alloy Bars" will be invalid. 611
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.