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ASTM A955/A955M-20b

Historical Revision

Standard Specification for Deformed and Plain Stainless Steel Bars for Concrete Reinforcement

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1.1 This specification covers deformed and plain stainless steel bars for concrete reinforcement in cut lengths and coils used in applications requiring resistance to corrosion, restrictive mechanical properties, or controlled magnetic permeability. This specification has a minimum actual tensile strength to actual yield strength ratio (Table 3). The standard sizes and dimensions of deformed bars and their numerical designation shall be those listed in Table 1.

1.1.1 A supplementary requirement (S1) is provided for use where a controlled magnetic permeability product is required by the purchaser. Supplementary Requirement S1 applies only when specified in the purchase order.

1.1.2 A supplementary controlled mechanical properties requirement (S2) is provided for use where a restricted yield strength range and a higher actual tensile to actual yield strength ratio is required by the purchaser. Supplementary Requirement S2 applies only when specified in the purchase order.

1.2 The chemical composition of the stainless steel alloy shall be selected for suitability to the application involved by agreement between the manufacturer and the purchaser. This is an important consideration in achieving the desired corrosion resistance or controlled magnetic permeability, or both, because these properties are not provided by all stainless steels.

1.3 Corrosion Resistance requirements are contained in Section 11 and Annex A1 and the test procedures options are Annex A2 (Rapid Macrocell Test) or Annex A3 (Cracked Beam Test).

1.4 The requirements for introduction of new alloys into a mandatory chemical composition requirements table in this specification are given in Annex A5.

1.5 Requirements for the relative deformation area of three-sided deformed bars are contained in Annex A4.

1.6 Bars are of three minimum yield strength levels, namely, 60 000 psi [420 MPa], 75 000 psi [520 MPa], and 80 000 psi [550 MPa], designated as Grade 60 [420], Grade 75 [520], or Grade 80 [550], respectively.

1.7 Plain bars in sizes up to and including 2 in. [50.8 mm] in diameter in coils or cut lengths are furnished in accordance with this specification in Grade 60 [420], Grade 75 [520], and Grade 80 [550], respectively. Mechanical testing, when required, shall be to the nearest nominal deformed bar size. Requirements providing for deformations and marking shall not be applicable to plain bars.

1.8 When stainless steel is to be welded, use a procedure suitable for the chemical composition and intended use or service.

Note 1: Welding of stainless steel reinforcement would occur after shipment from the manufacturer. Structural welding should be performed in accordance with the latest edition of AWS D1.6/D1.6M, any other internationally accepted stainless steel welding code, or a procedure suggested by the material manufacturer. AWS D1.6/D1.6M describes the proper selection of the filler metals, temperature control, as well as, performance, procedure qualification and inspection requirements.

1.9 This specification is applicable for orders in either inch-pound units (as Specification A955) or in SI units (as Specification A955M).

1.10 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.

1.11 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

1.12 This specification does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this specification to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.13 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


This specification covers deformed and plain stainless steel bars for concrete reinforcement proposed to be used in applications requiring corrosion resistance or controlled magnetic permeability. For each specimen, one tension test, one bend test, if required, and one set of dimensional property tests shall be made. For martensitic materials, two hardness tests shall be performed per lot of material. If the results of the test fail to meet the specified minimum requirements, a retest shall be permitted on two random specimens for each original tension specimen failure from the lot. If a specimen fails a bend test due to reasons other than mechanical or flaws, a retest shall be permitted on two random specimens from the same lot.


SDO ASTM: ASTM International
Document Number A955
Publication Date April 1, 2020
Language en - English
Page Count 15
Revision Level 20b
Supercedes
Committee A01.05
Publish Date Document Id Type View
May 1, 2020 A0955_A0955M-20C Revision
April 1, 2020 A0955_A0955M-20B Revision
March 1, 2020 A0955_A0955M-20A Revision
Jan. 1, 2020 A0955_A0955M-20 Revision
May 15, 2019 A0955_A0955M-19 Revision
Nov. 15, 2018 A0955_A0955M-18B Revision
Nov. 1, 2018 A0955_A0955M-18A Revision
Jan. 1, 2018 A0955_A0955M-18 Revision
Sept. 1, 2017 A0955_A0955M-17A Revision
March 15, 2017 A0955_A0955M-17 Revision
Sept. 15, 2016 A0955_A0955M-16A Revision
Jan. 15, 2016 A0955_A0955M-16 Revision
March 1, 2015 A0955_A0955M-15 Revision
March 1, 2014 A0955_A0955M-14 Revision
March 1, 2012 A0955_A0955M-12E01 Revision
March 1, 2012 A0955_A0955M-12 Revision
April 1, 2011 A0955_A0955M-11E01 Revision
April 1, 2011 A0955_A0955M-11 Revision
Oct. 1, 2010 A0955_A0955M-10A Revision
June 15, 2010 A0955_A0955M-10 Revision
Nov. 15, 2009 A0955_A0955M-09B Revision
Oct. 1, 2009 A0955_A0955M-09A Revision
May 1, 2009 A0955_A0955M-09 Revision
July 15, 2007 A0955_A0955M-07A Revision
March 1, 2007 A0955_A0955M-07 Revision
May 1, 2006 A0955_A0955M-06A Revision
March 1, 2006 A0955_A0955M-06 Revision
July 1, 2005 A0955_A0955M-05A Revision
April 1, 2005 A0955_A0955M-05 Revision
May 1, 2004 A0955_A0955M-04AE01 Revision
May 1, 2004 A0955_A0955M-04A Revision
March 1, 2004 A0955_A0955M-04 Revision
Oct. 1, 2003 A0955_A0955M-03B Revision
June 10, 2003 A0955_A0955M-03A Revision
April 10, 2003 A0955_A0955M-03 Revision
Nov. 10, 2002 A0955_A0955M-02 Revision
April 10, 2001 A0955_A0955M-96 Revision
April 10, 2001 A0955_A0955M-01 Revision