Welding process for 07Cr2AlMoR, Chemical composition of 07Cr2AlMoR

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07Cr2AlMoR is a steel used for pressure vessels; it belongs to the category of medium-temperature hydrogen-resistant steels. It is one of the three new grades added in GB713-2014 (07Cr2AlMoR, Q420R, 12Cr2Mo1VR). 1. The thickness range of 07Cr2AlMoR is between 6–60 mm. It is delivered in a normalized and tempered condition. 07Cr2AlMoR is produced using oxygen converters or electric furnaces, and it must undergo secondary refining. For ordering inquiries—Li Dan: 152*0375*0895. II. Chemical composition of 07Cr2AlMoR (mass percentage %): C Si Mn P S Cr Ni Cu Mo Al Ti ≤0.09 0.20–0.50 0.40–0.90 ≤0.020 ≤0.010 2.00–2.40 ≤0.30 ≤0.30 0.30–0.50 0.30–0.50 Note: At the request of the customer, appropriate amounts of rare earth elements can be added to the 07Cr2AlMoR steel plates. III. Mechanical properties of 07Cr2AlMoR Thickness/mm Test temperature/℃ 200 250 300 350 400 450 500 ReL (RP0.2)/MPa Not less than ≥20 -60 195 185 175 ---- Note: a is the specimen thickness, and d is the bend radius. IV. High-temperature mechanical properties of 07Cr2AlMoR: Plate thickness in mm, Tensile test, Impact test, Bend test. Rm/MPa, ReL/MPa, A/%, Temperature/°C, KV2/J. 180˚b=2a: Not less than, Not less than; Normalizing + tempering: 6–36, 420–580, 260–2120, 47; d=3a: >36–60, 410–570, 250. V. Current market situation for 07Cr2AlMoR: Due to the low demand for 07Cr2AlMoR in the market, there is no stock available of this material; customers generally order it in advance as a futures order. Wuyang Steel Plant is capable of producing 07Cr2AlMoR, and the steel plates it manufactures are of high quality. VI. Comparison Table of High-Temperature Mechanical Properties of 07Cr2AlMoR, 14Cr1MoR, and 12Cr2Mo1R
Grade Thickness/mm Test Temperature/°C: 200, 250, 300, 350, 400, 450, 500
ReLa (or Rp0.2)/MPa: Not less than
14Cr1MoR: >20–200: 255, 245, 230, 220, 210, 195, 176
12Cr2Mo1R: >20–200: 260, 255, 250, 245, 240, 230, 215
12Cr1MoV: >20–100: 200, 190, 176, 167, 157, 150, 142
12Cr2MoV: >20–200: 370, 365, 360, 355, 350, 340, 325
07Cr2AlMoR: >20–60: 145, 195, 185, 175 ——

VII. Manufacturing Method of 07Cr2AlMoR: The steel is produced by oxygen converters or electric furnaces, and must undergo secondary refining. The compression ratio of continuous casting billets and ingots shall be not less than 3 ； The compression ratio of the electroslag remelting billet shall be no less than 2. VIII. Delivery condition for 07Cr2AlMoR: normalizing + tempering; the tempering temperature for 18MnMoNbR and 13MnNiMoR should be no lower than 620℃ ； The tempering temperature for 15CrMoR and 14Cr1MoR steel plates should be no lower than 650℃ ； The tempering temperature for 12Cr2Mo1R, 12Cr1MoVR, 12Cr2Mo1VR, and 07Cr2AlMoR steel plates should be no lower than 680°C. 9. As required by the purchaser, the steel plates shall be subjected to ultrasonic testing one by one. The testing methods shall comply with the provisions of JB/T 4730.3, GB/T 2970, or GB/T 28297; the testing standards and acceptable quality levels shall be specified in the contract. The surface of the steel plate must be free from defects that are harmful to its use, such as cracks, bubbles, scars, folds, and inclusions.