GB/T 4185-1984 Molybdenum-tungsten alloy strip GB/T4185-1984 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Molybdenum-tungsten alloy bars
Molybdenum-tungsten alloy bars This standard applies to molybdenum-tungsten alloy bars (hereinafter referred to as alloy bars) made by powder metallurgy. 1 Brand, use and specifications of alloy bars
1.1 Brand and use shall comply with the provisions of Table 1. Table 1
The specifications of alloy bars shall comply with the provisions of Table 2.
2 Technical requirements
2.1 The chemical composition of alloy bars shall comply with the provisions of Table 3. Brand
2.2 Appearance:
2.2.1 The alloy bars shall have a gray metallic luster. Use
for rotary hammer drawing to make aluminum-tungsten alloy screw rods Table 2
UDC 669.2T'28
GB4185-84
(10~12) × (10~12) × (300~400) Table 3
Total impurity content
Not more than
2.2.2 The surface of the alloy bar shall not have water absorption. 2.2.3 The alloy bar shall not have defects such as overmelting, delamination, cracks, bubbling, splitting, staining, etc., and it is allowed to have 8mm long, 5mm wide, 1mm deep edge, corner drop and no more than 2 pits with a diameter of 1mm and a depth of 0.5mm on each side (no more than 5 per strip). 2.3 The shortest length of the alloy bar shall not be less than 300mm. 2.4 The straightness of the alloy bar shall not exceed 2% of the length. The density of the alloy bar shall comply with the provisions of Table 4.
National Bureau of Standards 1984-03-09 Issued
1984-11-01 Implemented
2.6 The cross section of the alloy strip should not be loose or mixed. 3 Test methods
GB4185-
12.0~12.6
10.5~11.0
3.1 According to the requirements of 2.2.1 and 2.2.3, the appearance of the alloy strip shall be checked visually (or with a magnifying glass). 3.1.1 According to the requirements of 2.2.2, the surface water absorption shall be checked with blue ink. 3.1.2 According to the requirements of 2.6 and 2.2.3, the cross section of the alloy strip may be checked for defects such as delamination, looseness, mechanical inclusions, pitting and surface cracks with a 5x magnifying glass.
3.2 According to the requirements of Article 2.1, the chemical composition of the alloy strip shall be analyzed in accordance with GB××××-84 "Chemical Analysis Method for Tungsten-Molybdenum Alloys". 3.3 According to the requirements of Article 2.5, the density of the alloy strip shall be determined in accordance with GB4196-84 "Determination Method for Density of Tungsten and Molybdenum Strips". 3.4 According to the requirements of Articles 2.3 and 2.4, the alloy strip shall be placed on a flat surface and the length and straightness shall be checked with a ruler. 4 Inspection Rules
4.1 The product shall be inspected by the supplier's quality inspection department to ensure that the product conforms to this standard. 4.2 The buyer shall inspect the product upon receipt. The product shall be inspected in accordance with this standard within three months from the date of arrival. If it is unqualified, it shall be returned to the supplier after identification by both parties.
4.3 The sample of chemical composition shall be randomly selected from each batch of submitted or produced products and sampled at one quarter of the upper chuck. For chemical analysis, it shall comply with Article 2.1. If it is unqualified, double the sample. If it is still unqualified, the batch of products shall be unqualified. 4.4 Take 1% of the samples from each batch of products submitted (no less than 1 piece per batch) to measure the density. It should comply with Article 2.5. If it fails, double the sample. If it still fails, the batch of products is unqualified. 4.5 100% inspection is carried out on Articles 2.2, 2.3 and 2.4. Those that do not meet the requirements are unqualified. 4.6 Take 1% of the samples from each batch of products submitted (no less than 1 piece per batch) for inspection. It should comply with Article 2.6. If it fails, double the sample. If it still fails, the batch of products is unqualified. 5 Packaging, marking, storage and transportation
5.1 Wrap 6 to 12 pieces of the product with paper and put them in a plastic bag. Tie the bag tightly and put it in a dry cardboard box, and stuff it with paper scraps to prevent movement. Put the cardboard box in a wooden box. The weight of each box shall not exceed 20kg. 5.2 The product brand, batch number and net weight should be marked on each box. Each box should be marked with the product name, net weight, and the words or signs "moisture-proof" and "fragile".
5.3 Each batch of products should be labeled and marked with: supplier name;
product brand:
product batch number,
various analysis and test results and inspection department stamp This standard number:
inspection date.
5.4 During transportation, the product should be protected from moisture and acid and alkali erosion, and violent collision is not allowed. 5.5 The product should be stored in a dry, ventilated and acid-free and alkali-free atmosphere. 30
GB4185—84
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This standard was proposed by the Standardization Research Institute of the Ministry of Electronics Industry. This standard was drafted by Factory 745 of the Ministry of Electronics Industry. The main drafter of this standard is Ding Guizhen.
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