Steel Q420R is a newly pressure vessel steel grade, which replaces 18MnMoNbR. THe impact temperature is -20℃.
Standard: GB713-2014 Steel plates for boilers and pressure vessels
National standard newly added grades,
Q420R steel is mainly used in the manufacture of mobile pressure vessels. It is often used in automobile tank trucks and railway tank trucks. It has high strength, high toughness and excellent welding performance, which makes production difficult. At present, only a few domestic companies can produce, and the market prospects are broad.
Q420R mechanical properties and process performanceGrade Delivery condition Steel plate thickness Tensile test Impact test Bend test b Rm / MPa ReLa / MPa A /% Temperature / ℃ KV2 / J 180 ° b = 2a
Q420R normalizing 10 ~ 20 ≤590 ~ 720 ≤420 ≤18 ≤-20 ≤60 ≤d = 3a
Q420R normalizing> 20 ～ 30 ≤570 ～ 700 ≤400
With the consent of the purchaser, chromium-molybdenum steel plates with a thickness of more than 60mm can be delivered after normalizing and accelerated cooling and tempering.
The GB713 Q420R steel sheets and plates shall be delivered in a sheared or flame-cut state. When the equipment capacity is limited, with the consent of the acquirer and stated in the contract, delivery in the burr state is allowed.
According to the requirements of the purchaser, Q245R,
Q345R,
Q370R, Q420R and other grades can specify carbon equivalents, the value of which shall be agreed upon by both parties.
Q420R delivery status: normalizing, -20 ℃ impact
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