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Ambient temperature physical properties, including density, modulus of elasticity (Young’s modulus), coefficient of thermal expansion, thermal conductivity, specific heat (heat content or heat capacity) and electrical resistivity for a range of ferritic, martensitic, austenitic and duplex stainless steel types are tabulated. Some explanation of the units used for these properties is given.
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Pitting resistance equivalent numbers (PREN) are a theoretical way of comparing stainless steels, using their chemical compositions. The formulae are based mainly on chromium, molybdenum and nitrogen contents. Grades with a PREN of 40 or more are known as ‘super’ austenitics or duplex types, depending to which basic family they belong. A table of calculated PREN values compares some of the ferritic, austenitic and duplex steel grades.
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BS EN 10283 is the material standard for stainless steel castings for corrosion resisting purposes. The chemical composition of stainless steel grades covered in the this standard include 1.4011 1.4008 1.4317 1.4405 1.4411 1.4525 1.4309 1.4308 1.4552 1.4409 1.4408 1.4581 1.4412 1.4446 1.4458 1.4527 1.4584 1.4416 1.4587 1.4588 1.4593 1.4347 1.4470 1.4468 1.4517 1.4417 and 1.4469.
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BS EN 10028-7 is the material standard for stainless steel sheet, plate and strip for pressure purposes. The current edition was published in December 2007. The grades are mostly a subset of the grades covered in BS EN 10088-2 for general purposes. There are also a number of creep resisting steels from BS EN 10302. The chemical composition of stainless steel grades covered in the this standard are:
Ferritic 1.4003 1.4516 1.4520 1.4510 1.4513 1.4521 1.4526 1.4509
Martensitic 1.4313 1.4418
Austenitic 1.4318 1.4307 1.4306 1.4315 1.4311 1.4301 1.4541 1.4550 1.4335 1.4404 1.4406 1.4401 1.4466 1.4571 1.4580 1.4432 1.4429 1.4436 1.4435 1.4434 1.4438 1.4439 1.4563 1.4539 1.4537 1.4547 1.4529
Duplex 1.4362 1.4462 1.4507 1.4410 1.4501
Creep Resisting 1.4910 1.4941 1.4948 1.4950 1.4951 1.4958 1.4959 1.4961
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BS EN 10296-3 and 10253-4 are the material standards for austenitic and duplex stainless steels for butt-welding fittings without and with specific inspection requirements. They were published in December 2008.
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BS EN 10216-5 2004 is the European standard: Seamless stainless steel tubes for pressure purposes- Technical delivery conditions. It contains austenitic, duplex, creep resisting stainless steels. There are no ferritic, martensitic or heat resisting steels.
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Duplex stainless steels are becoming more commonly used in a range of applications. This article explains the basic metallurgy and their advantages and disadvantages.
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A summary of the EN standards for stainless steel products showing which grades appear in which standards.
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Duplex Stainless Steels are growing at a high rate. It is important to understand how they differ from the more familiar stainless steels and how these differences affect the fabrication methods and parameters
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In EN 10088-2 and EN 10088-3 the chemical composition ranges are defined for the cast analysis. Any subsequent product analysis may deviate from these ranges by the amounts specified in this article
