Origin: WISCO, Xianggang, Xingang, WISCO, Chongqing Steel, Nangang and Jinan Steel.
"D" is the first letter of low pinyin, and "R" is the first letter of Rong pinyin.
09MnNiDR is a low temperature steel with body-centered cubic crystal. The main performance requirement of low temperature steel is to ensure sufficient toughness and brittle failure resistance at the service temperature. In order to ensure low-temperature toughness, the carbon content in low-temperature steel should be reduced as much as possible, the contents of S and P should be strictly limited, and some alloying elements should be added. Manganese and nickel are two main elements to improve the toughness of steel. Mn refines the structure of steel, which can reduce the cementite at the grain boundary after slow cooling, thus improving the toughness of steel; Ni makes the matrix itself easy to cross and slip at low temperature, which improves the toughness.
2. Scope of application
Manufacture of deethanizer, CO2 absorber, medium pressure flash tower, cooler, deethanizer, reabsorber, compressor shell, propane low temperature storage tank, etc. Used in petroleum and chemical equipment.
3. Delivery status
09MnNiDR, delivery status: normalizing or normalizing+tempering quenching+tempering -70 degree low temperature impact.
4. Chemical composition
Brand chemical composition (mass fraction) Wt%?
C-Si-Mn-Ni-V-Nb Alt P S?
Not greater than?
09 mnnidr≤0. 12 0. 15 ~ 0.50 1.20 ~ 1.60 0.3 ~ 0.8—≤0.04≥0.020 0.020 0.008？
The content range of spot implementation of national standard is described in the above table, and the content of chemical elements can be controlled according to the design requirements in futures contracts.
Mechanical properties of 5,09 09MnNiDR
Brand steel plate thickness /mm tensile test impact test bending test?
Tensile strength Rm, MPa yield strength elongation A/% temperature /V-shaped impact work 180?
Not less than not less than b=2a?
09 mnnidr 6 ~ 16 440 ~ 570 300 23-70 34d = 2a？
& gt 16~36 430~560 280?
& gt36~60 430~560 270?
& gt60~ 120 420~550 260?
Use of 6,09 09MnNiDR
09MnNiDR steel is a low temperature steel with ferrite and a little pearl. Because of its low carbon content, it belongs to low alloy structural steel, and manganese and nickel are its main alloys. Mn mainly improves the strength of steel through solution strengthening, while Ni can improve the low-temperature toughness of ferrite and obviously reduce the cold-brittle transition temperature. Its carbon equivalent is less than or equal to 0.44, its hardening tendency is small, it is not easy to form cold cracks, and the weld has good plasticity and toughness, so preheating is usually not needed. When the plate thickness exceeds a certain thickness, the joint stiffness is limited or the carbon equivalent is high, preheating should be considered. However, the preheating temperature should not be too high, otherwise the grains in the heat affected zone will grow and oxides will be precipitated at the grain boundaries. Therefore, the weld energy and interlayer temperature should be controlled during welding, and heat treatment should be carried out after welding to eliminate stress.
7. Mechanical properties
The sampling position of mechanical properties shall comply with gb/t2975. For steel plates with a thickness greater than 40 mm, the axis of the impact specimen should be located at a quarter of the thickness.
The packaging, marks and quality certificates of steel plates shall comply with the provisions of gb/t247.
Comparison of tensile and impact test results between WISCO 09MnNiDR and Germany imported 13mnni6-3;
Grade thickness state sampling direction yield strength σa tensile strength σb δ5% ψ% -70akv transverse (J)?
09MnNiDR 24 normalized horizontal 380-410 520-530 31-32 73-75 282 286 288?
13mnni6-3 24 normalized horizontal 390-385 575-580 29-3175-7419516661?
8. Impact performance
The above results show that the steel plate for low-temperature pressure vessel produced by WISCO has good toughness fit and low-temperature impact toughness, and the physical quality exceeds or approaches the physical quality of the same brand steel plate produced by foreign enterprises.
Total inclusions in steel with thickness of mm% al2o3% sio2% mno% feo%?
038 15 mnn br 0.00 13 0.0003 0.0002 0.000 1 0.000 1？
3 sa 662 GRC 0.00 16 0.0004 0.000 1 0.000 1 0.0002？
659 16 mndr 0.00 15 0.0004 0.0002 0.000 1 0.000 1？
9 09 mnnidr 0.00 13 0.0003 0.000 1 0.0002 0.000 1？
The steel plate for low-temperature pressure vessel has good low-temperature toughness under the premise of ensuring strength through the synergistic effect of various alloying elements. Mainly used for manufacturing low-temperature pressure vessels of -20 ~-70. 09MnNiDR is mainly used to manufacture deethanizer, CO2 absorber, medium pressure flash tower, cooler, deethanizer, reabsorber, compressor shell, propane cryogenic storage tank, etc.
The company's main products: WISCO produces low-alloy high-strength steel plates, alloy structural steel plates, boiler pressure vessel plates, hydrogen chromium molybdenum steel plates, bridge plates, building structural steel plates, shipbuilding steel plates, die steel plates, non-quenched and tempered wear-resistant steel plates/quenched and tempered wear-resistant steel plates, quenched and tempered high-strength steel plates and other 12 series products.
Specifications are 8-650mm thick, 1500-4020mm wide and 3000-27000mm long.