T/COS 019-2025 Specifications for weldable aluminum alloy forged parts used in armored vehicles

Scope

Scope: This specification stipulates the requirements, quality assurance provisions, and delivery preparations for weldable aluminum alloy forgings of 7C05, 7C52, and 7A62 used in armored vehicles. This specification applies to 7C05, 7C52, and 7A62 aluminum alloy forged parts, free forged parts, and rolled forged rings (referred to as rolled rings) used in armored vehicles. Main technical contents: 3.1 Alloy grade, condition, and category: The alloy grade, supply condition, and category of forgings shall comply with Table 1. Table 1: Forging grade, condition, and category Grade Supply condition Forging category 7C05T6 As specified in the drawing 7C52T6 7A62T7 3.2 Chemical composition: The chemical composition of forgings shall comply with Table 2. 3.3 Hydrogen content: The hydrogen content of forgings includes liquid hydrogen content and solid hydrogen content. The specific control values shall be agreed upon by the supplier and purchaser. If the purchaser has requirements for the hydrogen content of forgings, they shall be specified in the purchase documents. 3.4 Mechanical properties: 3.4.1 Hot-treated forgings with a thickness not exceeding 150 mm: The room-temperature tensile mechanical properties of forgings shall comply with Table 3. Hot-treated forgings with a thickness exceeding 150 mm: The room-temperature tensile mechanical properties of forgings shall be agreed upon by the supplier and purchaser and accompanied by actual measurement results. Annealing or forged condition delivery is allowed. 3.4.2 Test the Brinell hardness on the surface of forgings or at specified locations. The hardness value shall meet the requirements of Table 3. Table 2: Chemical composition of forgings Unit: % by mass Grade Si Fe Cu Mn Mg Cr Zn Ti Zr Be Other Al Total Single Balance 7C05 ≤ 0.12 ≤ 0.15 ≤ 0.100.15~0.351.1~1.9≤ 0.104.2~5.0≤ 0.040.08~0.18-≤ 0.05≤ 0.15Balance 7C52 ≤ 0.2 ≤ 0.250.05~0.200.10~0.402.0~2.8≤ 0.254.

Development Information

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