Material requirements for methanol scrubber towers: SA 203Gr.E and SA 537 CL1
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For a certain methanol washing tower, the design temperature ranges from -70 to -45 to 70 degrees Celsius, the design pressure is 6.4 MPa, the diameter is 3600 mm, and the total height is approximately 69 m. The main materials to be used are imported SA 203Gr.E and SA 537 CL1, with thicknesses of around 98 mm and 102 mm respectively. Please discuss the technical requirements for ordering these materials, including their chemical composition, mechanical properties, hardness, grain size, heat treatment, non-destructive testing, and so on
The low-temperature shock value is a control value that must be specified. It is not lower than the **relevant standards**, and the preparation of the test specimens must also comply with these standards. It is recommended to gain a thorough understanding of these material standards and compare them with domestic standards in order to establish feasible technical requirements.
Technical specifications for ordering SA203GrE from our company: Chemical composition of the steel plate, in wt%: Thickness – CSiMnPSNi; Melting analysis, finished product analysis, melting analysis, finished product analysis, melting analysis, finished product analysis: ≤50, ≤0.20, 0.15–0.40, 0.13–0.45, ≤0.70, ≤0.78, ≤0.015, ≤0.015; 3.25–3.75, 3.18–3.82. For thicknesses >50–100: ≤0.23, ≤0.80, ≤0.88, ≤0.015, ≤0.015. Rp0.2MPa, RmMPa, A50%, surface hardness HB, cold bending at 180°–101°C AKV, J, transverse direction – average value of three samples, individual value: ≥275, 485–620, ≥21, ≤220; d=3a, intact condition: ≥27, ≥20
Our company’s SA203GrE material passed the evaluation by **Rong Biao Wei in June 2008. It has been supplied in large quantities for key domestic construction projects, with a maximum thickness of 100 mm. For example, the ethylene distillation tower in Yanshan Petrochemical’s ethylene expansion project, the desulfurization tower at Jinan Refinery, as well as the methanol washing tower and hydrogen sulfide concentration tower in the Ordos dimethyl ether project. According to customer feedback, the SA203E steel produced by Wugang fully meets the requirements for the design and practical use of low-temperature pressure vessels, earning high praise from the departments that use it. Wugang Panglong
This post was last edited by phy0001 on 2010-9-9 at 22:05. Regarding A537Cl1, if the thickness is 102 mm, I think the original poster is mistaken; for Cl1, the maximum thickness permitted by ASME standards is 100 mm. For thicknesses exceeding this value, Cl2 is a more suitable choice. With unchanged chemical composition, the thickness can go up to 150 mm, and its yield and tensile strength are one grade higher than those of Cl1. The method of delivery has also changed. Currently, both SA203GrE and SA537 can be produced domestically, and they both perform excellently, so there is no need to import them. Wugang Panglong
Reply to 5# phy0001: Thank you for the information provided above. The design institute recommended SA537CL1, but it also increased some of the specifications. What is the price difference between CL1 and CL2? It can also be communicated via in-site short messages
The price difference is not small. Tell me the specifications from the design institute, and I’ll see if CL1 is feasible. The design institute may have done this for that reason; after all, it’s only 2mm – a difference of that size is indeed not cost-effective. Perhaps 100mm would be sufficient for this design. The 2mm represents a safety margin left by the design institute itself. Wu Gang Pang Long