T/CI 126-2022 Abolished Group standards

T/CI 126-2022 Petrochemical-grade stainless steel valve casting

Publish Date: 2022-12-01 Implement Date: 2022-12-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/CI 126-2022

Standard Type: Group standards

Standard Status: Abolished

is_force_gb: no

CCS Name: -

ICS Name: \nValve Comprehensive

Publish Date: 2022-12-01

Implement Date: 2022-12-01

Scope

Scope: This document specifies the terms and definitions, basic requirements, technical requirements, test methods, inspection rules, quality certificates, marking, protection, packaging, transportation, and storage of stainless steel valve castings used in the petrochemical industry. This document is applicable to stainless steel valve castings (hereinafter referred to as "castings") used in the petrochemical industry with a nominal pressure of PN≤2.5 MPa, a nominal size of DN≤200, an operating temperature of -200 ℃≤T≤400 ℃, and a working medium of liquid. Main technical content: 4. Basic requirements 4.1 Raw materials for castings: Casting ingots or scrap materials with the same composition, gating systems, risers, and discarded castings can be used as recycled materials. After remelting and refining the recycled materials, their chemical compositions must meet the requirements of Table 1. 4.2 Manufacturing requirements 4.2.1 Casting melting should use medium-frequency induction furnaces or other secondary refining methods, and the production method shall be determined by the casting manufacturer. 4.2.2 Welding repair 4.2.2.1 Casting defects are allowed to be repaired by welding. Before welding repair, all casting defects must be cleaned up completely, and the welding repair should not affect the use and appearance quality of the castings. 4.2.2.2 Welding process evaluation shall be carried out in accordance with the requirements of NB/T 47014. 4.2.2.3 After welding repair, stress relief heat treatment shall be carried out, and the castings shall be inspected according to the same standards as the inspection of the castings to confirm that the welding repair is qualified. 4.2.2.4 Castings with any of the following defects are not allowed to be repaired by welding: a) Defects that are not allowed to be repaired by welding as specified in the drawings or the order contract; b) Those with honeycomb-shaped air holes; c) Those with leakage during the pressure test of