ASTM-A955/A955M, 2017

ASTM

A955/A955M-17a Standard Specification for Deformed and Plain Stainless-Steel Bars for Concrete Reinforcement

Edition: 2017

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Description of ASTM-A955/A955M 2017

ASTM A955/A955M-17a

Historical Standard: Standard Specification for Deformed and Plain Stainless-Steel Bars for Concrete Reinforcement

ASTM A955/A955M

Scope

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 or controlled magnetic permeability. The standard sizes and dimensions of deformed bars and their numerical designation shall be those listed in Table 1. 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.

TABLE 1 Deformed Bar Designation Numbers, Nominal Weights [Masses], Nominal Dimensions, and Deformation Requirements

Bar Designation No.	Nominal Weight, lb/ft [Nominal Mass, kg/m]^A		Nominal Dimensions^B			Deformation Requirements, in. [mm]
	400 Series; Duplex Alloys	300 Series	Diameter, in. [mm]	Cross-Sectional Area, in.² [mm²]	Perimeter, in. [mm]	Maximum Average Spacing	Minimum Average Height	Maximum Gap per Side^C
	400 Series; Duplex Alloys	300 Series	Diameter, in. [mm]	Cross-Sectional Area, in.² [mm²]	Perimeter, in. [mm]	Maximum Average Spacing	Minimum Average Height	Two-Sided Bar	Three-Sided Bar
3 [10]	0.374 [0.556]	0.378 [0.562]	0.375 [9.5]	0.11 [71]	1.178 [29.9]	0.262 [6.7]	0.015 [0.38]	0.143 [3.6]	0.097 [2.5]
4 [13]	0.679 [1.011]	0.686 [1.021]	0.500 [12.7]	0.20 [129]	1.571 [39.9]	0.350 [8.9]	0.020 [0.51]	0.191 [4.9]	0.129 [3.3]
5 [16]	1.048 [1.559]	1.058 [1.575]	0.625 [15.9]	0.31 [199]	1.963 [49.9]	0.437 [11.1]	0.028 [0.71]	0.239 [6.1]	0.162 [4.1]
6 [19]	1.495 [2.225]	1.511 [2.248]	0.750 [19.1]	0.44 [284]	2.356 [59.8]	0.525 [13.3]	0.038 [0.97]	0.286 [7.3]	0.194 [4.9]
7 [22]	2.038 [3.032]	2.059 [3.064]	0.875 [22.2]	0.60 [367]	2.749 [69.8]	0.612 [15.5]	0.044 [1.12]	0.334 [8.5]	0.226 [5.8]
8 [25]	2.685 [3.995]	2.713 [4.037]	1.000 [25.4]	0.79 [510]	3.142 [79.8]	0.700 [17.8]	0.050 [1.27]	0.383 [9.7]	0.259 [6.6]
9 [29]	3.396 [5.053]	3.441 [5.106]	1.128 [28.7]	1.00 [645]	3.544 [90.0]	0.790 [20.1]	0.056 [1.42]	0.431 [10.9]	0.292 [7.4]
10 [32]	4.312 [6.416]	4.358 [6.484]	1.270 [32.3]	1.27 [819]	3.990 [101.3]	0.889 [22.6]	0.064 [1.63]	0.487 [12.4]	0.329 [8.3]
11 [36]	5.296 [7.880]	5.352 [7.964]	1.410 [35.8]	1.56 [1006]	4.430 [112.5]	0.987 [25.1]	0.071 [1.80]	0.540 [13.7]	0.365 [9.3]
14 [43]	7.64 [11.37]	7.72 [11.49]	1.693 [43.0]	2.25 [1452]	5.32 [135.1]	1.185 [30.1]	0.085 [2.16]	0.648 [16.5]	0.438 [11.1]
18 [57]	13.59 [20.22]	13.72 [20.43]	2.257 [57.3]	4.00 [2581]	7.09 [180.1]	1.58 [40.1]	0.102 [2.59]	0.864 [21.9]	0.584 [14.8]

(A) The 400 and Duplex-Alloy Series is based on a density of 489.59 lb/ft³ [7833.4 kg/m³ ]. The 300 Series is based on a density of 494.78 lb/ft³ [7916.5 kg/m³]. Density varies with alloy content which may result in a variation of several percent.

(B) The nominal dimensions of a deformed bar are equivalent to those of a round bar having the same weight [mass] per foot [metre] as the deformed bar.

(C) The maximum gap (measured as a chord) between the ends of the deformations shall not exceed 25 %/n of the nominal perimeter of the bar, where n is the number of longitudinal gaps or longitudinal ribs around the perimeter of the bar.

1.1.1 Supplementary requirement (S1) of an optional nature is provided. It shall apply only when specified by the purchaser. In order to obtain a controlled magnetic permeability product, steel conforming to Supplementary Requirement S1 should be ordered.

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.

Note 1: The alloys shown in Table 2 have found the most use in North America. Other alloys may also provide desired properties; consult with the manufacturer for stainless steel alloy properties and availability.

TABLE 2 Chemical Requirements of Typical Alloys^A

UNS Designation		Composition %
UNS Designation	Type	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Chromium	Nickel	Molybdenum	Nitrogen
S24000	XM-29	0.08	11.50- 14.50	0.060	0.030	1.00	17.00- 19.00	2.25- 3.75	....	0.20- 0.40
S24100	XM-28	0.15	11.00- 14.00	0.060	0.030	1.00	16.50- 19.00	0.50- 2.50	....	0.20- 0.45
S30400	304	0.08	2.00	0.045	0.030	1.00	18.00- 20.00	8.00- 10.50	....	0.10
S31603	316L	0.03	2.00	0.045	0.030	1.00	16.00- 18.00	10.00- 14.00	2.00-3.00	0.10
S31653	316LN	0.03 max	2.00	0.045	0.030	1.00	16.00- 18.00	10.00- 14.00	2.00-3.00	0.10- 0.16
S31803	....	0.03	2.00	0.030	0.020	1.00	21.00- 23.00	4.50- 6.50	2.50-3.50	0.08- 0.20

(A) Maximum, unless otherwise indicated.

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

1.4 Bars are of two minimum yield strength levels, namely, 60 000 [420 MPa] and 75 000 psi [520 MPa], designated as Grade 60 [420] and Grade 75 [520], respectively.

1.5 Plain bars in sizes up to and including 2 in. [50.8 mm] in diameter in coils or cut lengths, when ordered, shall be furnished under this specification in Grade 60 [420] and Grade 75 [520], respectively. Bending properties, when required, shall be by agreement between the manufacturer and purchaser. Requirements providing for deformations and marking shall not be applicable to plain bars.

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

Note 2: Welding of stainless steel reinforcement would occur after shipment from the producer. 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 producer. AWS D1.6/D1.6M describes the proper selection of the filler metals, temperature control, as well as, performance, procedure qualification and inspection requirements.

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

1.8 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 are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

1.9 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.

1.10 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.

Keywords

concrete reinforcement; corrosion resistance; deformations (protrusions); magnetic properties; stainless steel bars ;

ICS Code

ICS Number Code 77.140.60 (Steel bars and rods)

DOI: 10.1520/A0955_A0955M-17A

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Description of ASTM-A955/A955M 2017

ASTM A955/A955M-17a

Historical Standard: Standard Specification for Deformed and Plain Stainless-Steel Bars for Concrete Reinforcement

ASTM A955/A955M

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Description of ASTM-A955/A955M 2017

ASTM A955/A955M-17a

Historical Standard: Standard Specification for Deformed and Plain Stainless-Steel Bars for Concrete Reinforcement

ASTM A955/A955M

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