【Weekly Topic】 Issues with Steels Specifically for Pressure Vessels (2011.06.20-06.26)
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Article 2.3.2 of the new regulatory standards – For carbon steel and low-alloy steel materials (steel plates, steel pipes, and steel forgings) used in pressure vessels, the phosphorus and sulfur contents must meet the following requirements: (1) General requirements for carbon steel and low-alloy steel materials: P≤0.030%, S≤0.020%； (2) For steels with a minimum standard tensile strength of 540 MPa or higher, P≤0.025％ and S≤0.015％ ； (3) For steel designed for temperatures below -20°C and with a minimum standard tensile strength of less than 540 MPa, P≤0.025％, S≤0.012％ ； (4) For steel designed for temperatures below -20°C and with a minimum standard tensile strength of 540 MPa or higher, P ≤ 0.020% and S ≤ 0.010%. The question now is—how is the steel specifically designed for pressure vessels defined? Which standards apply to steels specifically designed for pressure vessels (other than GB713-2008, GB3531-2008, and GB19189-2006)? For example: the standards for steel pipes.
The interpretation of the new Code for Pressure Vessels specifies clearly that steels dedicated for pressure vessels refer to those grades that meet the following standards: GB713, GB3531, GB19189, GB9948, JB/T4726, JB/T4727; of course, GB 24511 also falls under this category. GB 713-2008 Steel plates for boilers and pressure vessels; GB 3531-2008 Low-alloy steel plates for low-temperature pressure vessels; GB 19189-2003 Quenched and tempered high-strength steel plates for pressure vessels; GB 9948-2006 Seamless steel tubes for petroleum cracking; JB/T 4726 Forged carbon steel and low-alloy steel forgings for pressure vessels; JB/T 4727 Low-alloy steel forgings for low-temperature pressure vessels; GB 24511-2009 Stainless steel plates and strips for pressure-bearing equipment
Reply to 1# Shenlan Yipan: According to clause 2.3.2 of the new regulatory standards, for carbon steel and low-alloy steel materials (steel plates, steel pipes, and steel forgings) used in pressure vessels, their phosphorus and sulfur contents must meet the following requirements: (1) General requirements for carbon steel and low-alloy steel materials: P≤0.030%, S≤0.020%； (2) For steels with a minimum standard tensile strength of 540 MPa or higher, P≤0.025％ and S≤0.015％ ； (3) For steel designed for temperatures below -20°C and with a minimum standard tensile strength of less than 540 MPa, P≤0.025％, S≤0.012％ ； (4) For steel designed for temperatures below -20°C and with a minimum standard tensile strength of 540 MPa or higher, P ≤ 0.020% and S ≤ 0.010%. The question now is—how is the steel specifically designed for pressure vessels defined? Which standards apply to steels specifically designed for pressure vessels (other than GB713-2008, GB3531-2008, and GB19189-2006)? For example: the standards for steel pipes.
This post was last edited by Northwest Wolf on 2011-6-20 at 13:19. The interpretation of the new regulatory standards specifies that steels specifically designed for pressure vessels are those that meet the requirements of the following standards: GB713, GB3531, GB19189, GB9948, JB/T4726, JB/T4727. Of course, GB 24511 also falls under this category. GB 713-2008 Steel plates for boilers and pressure vessels; GB 3531-2008 Low-alloy steel plates for low-temperature pressure vessels; GB 19189-2003 Quenched and tempered high-strength steel plates for pressure vessels; GB 9948-2006 Seamless steel tubes for petroleum cracking; JB/T 4726 Forged carbon steel and low-alloy steel forgings for pressure vessels; JB/T 4727 Low-alloy steel forgings for low-temperature pressure vessels; GB 24511-2009 Stainless steel plates and strips for pressure-bearing equipment
Steel plate standards: GB713-2008 \"Steel plates for boilers and pressure vessels\", GB3531-2008 \"Low-alloy steel plates for low-temperature pressure vessels\", GB19189-2003 \"High-strength steel plates for pressure vessels\", GB24511-2009 \"Stainless steel plates and strips for pressure-bearing equipment\"
Some people say that GB24511-2009 \"Stainless steel plates and strips for pressure equipment\" is not included in GB150-1998; technical evaluation must be conducted after the new version of GB150 is released before it can be used. Some design institutes still use GB/T4237-2007 for hot-rolled stainless steel sheets and strips, while others have adopted GB24511-2009 \"Stainless steel sheets and strips for pressure-bearing equipment\".
GB/T 699 High-quality carbon structural steel; GB 713 Steel plates for boilers and pressure vessels; GB/T 1220 Stainless steel bars; GB/T 1221 Heat-resistant steel bars; GB/T 3077 Alloy structural steel; GB 3531 Low-alloy steel plates for low-temperature pressure vessels; GB/T 4226 Stainless steel bars for cold working; GB 5310 Seamless steel tubes for high-pressure boilers; GB 6479-2000 Seamless steel tubes for high-pressure fertilizer equipment; GB/T 8163 Seamless steel tubes for fluid transport; GB 9948 Seamless steel tubes for petroleum cracking; GB/T 12771 Welded stainless steel pipes for fluid transport; GB 13296 Stainless steel seamless pipes for boilers and heat exchangers; GB/T 14976 Stainless steel seamless pipes for fluid transport; GB 19189 Quenched and tempered high-strength steel plates for pressure vessels; GB/T 20878 Grades and chemical compositions of stainless steel and heat-resistant steel; GB/T 21832 Welded austenite-ferritic duplex stainless steel pipes; GB/T 21833 Seamless austenite-ferritic duplex stainless steel pipes; GB 24511 Stainless steel plates and strips for pressure-bearing equipment; GB/T 24593 Welded austenitic stainless steel pipes for boilers and heat exchangers; NB/T 47002.1 Explosively welded composite plates for pressure vessels – Part 1: Stainless steel-steel composite plates; NB/T 47002.2 Explosively welded composite plates for pressure vessels – Part 2: Nickel-steel composite plates; NB/T 47002.3 Explosively welded composite plates for pressure vessels – Part 3: Titanium-steel composite plates; NB/T 47002.4 Explosively welded composite plates for pressure vessels – Part 4: Copper-steel composite plates; NB/T 47008 Forged carbon steel and alloy steel parts for pressure-bearing equipment; NB/T 47009 Forged low-alloy steel parts for low-temperature pressure-bearing equipment; NB/T 47010 Forged stainless steel and heat-resistant steel parts for pressure-bearing equipment; ISO 9328-2:2004 Steel plates and strips for pressure-bearing equipment – Technical conditions for supply – Part 2: Non-alloy and alloy steels with specified high-temperature properties
My understanding is that the steel specifically designed for pressure vessels should be a pressure-bearing steel material that can be used in the standards referenced by the vessel regulations. The referenced standard is in clause 1.10 of the dimensional tolerance specifications. Such as GB150, GB151, etc. In those books that provide explanations and answers to questions, the preface at the beginning states that they have no legal validity and should not be considered as interpretations of the regulations; rather, they serve as exemption clauses based on those regulations. . . . . It’s really frustrating.
This post was last edited by Northwest Wolf on 2011-6-20 at 13:16. Steels specifically designed for pressure vessels include steel plates, steel pipes, and steel forgings; these are mainly the materials specified in various standards for materials used in pressure vessels. The relevant standards are as follows: Steel plate standards: GB713-2008 \"Steel plates for boilers and pressure vessels\", GB 3531-2008 \"Low-alloy steel plates for low-temperature pressure vessels\", and GB 19189-2003 \"Quenched and tempered high-strength steel plates for pressure vessels\". Steel pipe standard: GB 9948-2006 \"Seamless steel pipes for petroleum cracking\". Standards for steel forgings: JB/T 4726 \"Forgings of carbon steel and low-alloy steel for pressure-bearing equipment\" (approved in 2009), JB/T 4727 \"Forgings of low-alloy steel for low-temperature pressure-bearing equipment\" (approved in 2009), GB 5310-2008 \"Seamless steel tubes for high-pressure boilers\". GB24511-2009: Pressure equipment – Stainless steel plates and strips
In response to 6# zhxng, Document No. 86 issued by the Capacity Standards Committee has clearly stated that GB24511-2009 replaces GB/T4237 as the standard for steel used in pressure vessels
The standards for forgings used in pressure-bearing equipment have been officially issued: «NB/T 47008-2010 Forgings of carbon steel and alloy steel for pressure-bearing equipment», «NB/T 47009-2010 Forgings of low-alloy steel for low-temperature pressure-bearing equipment», and «NB/T 47010-2010 Forgings of stainless steel and heat-resistant steel for pressure-bearing equipment»