ASTM A1066/A1066M-11
(Specification)Standard Specification for High-Strength Low-Alloy Structural Steel Plate Produced by Thermo-Mechanical Controlled Process (TMCP)
Standard Specification for High-Strength Low-Alloy Structural Steel Plate Produced by Thermo-Mechanical Controlled Process (TMCP)
ABSTRACT
This specification covers high-strength low-alloy structural steel plates that were produced by the thermo-mechanical controlled process (TMCP). This method consists of rolling reductions and cooling rate controls, which result in mechanical properties in the finished plate that are equivalent to those attained using conventional rolling and heat treatment processes.
SCOPE
1.1 This specification covers steel plates produced by the thermo-mechanical controlled process (TMCP). Five grades are defined by the yield strength: 50 [345], 60 [415], 65 [450], 70 [485], and 80 [550]. The plates are intended primarily for use in welded steel structures.
1.2 The TMCP method consists of rolling reductions and cooling rate controls that result in mechanical properties in the finished plate that are equivalent to those attained using conventional rolling and heat treatment processes, which entail reheating after rolling. A description of the TMCP method is given in Appendix X1.
1.3 The maximum thicknesses available in the grades covered by this specification are shown in Table 1.
1.4 Due to the special combination of mechanical and thermal treatment inducing lower rolling temperatures than for conventional hot rolling the plates can not be formed at elevated temperatures without sustaining significant losses in strength and toughness. The plates may be formed and post-weld heat-treated at temperatures not exceeding 1050°F [560°C]. Higher temperatures may be possible if proven that minimum mechanical characteristics are retained after tests with specimens in the post-weld heat treatment (PWHT) condition. For flame straightening higher temperatures can be used in accordance with the steel manufacturer’s recommendations.
1.5 If the steel is to be welded, a welding procedure suitable for the grade of steel and intended use or service is to be utilized. See Appendix X3 of Specification A6/A6M for information on weldability.
1.6 Supplementary requirements are available but shall apply only if specified in the purchase order.
1.7 The values stated in either inch-pound-units 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 is to be used independently of the other, without combining values in any way.
TABLE 1 Chemical Requirements (Heat Analysis) ElementContent in [%] Grade 50 [345]Grade 60 [415]Grade 65 [450]Grade 70 [485]Grade 80 [550] ThicknessMax 4 in.
[100 mm]Max 4 in.
[100 mm]Max 3 in.
[75 mm]Max 2 in.
[50 mm]Max 1 in.
[25 mm] Carbon, max0.14A0.160.160.160.16 Manganese0.70–1.600.80–1.700.80–1.700.80–1.701.00–2.00 Phosphorus, max0.0300.0300.0300.0300.030 Sulfur, max0.0200.0200.0200.0200.020 Silicon0.15–0.500.15–0.500.15–0.500.15–0.500.15–0.50 Copper, max0.350.350.350.350.35 Nickel, max0.300.700.700.700.70 Chromium, max0.300.300.300.350.40 Molybdenum0.100.200.250.300.40 Columbium, max0.050.050.050.050.10 Vanadium, max0.080.0080.080.090.09 Aluminium, min0.020 total or
0.015 solubleB0.020 total or
0.015 solubleB0.020 total or
0.015 solubleB0.020 total or
0.015 solubleB0.020 total or
0.015 solubleB Boron, max0.0020.0020.0020.0020.002
A When Supplementary Requirement S75 is ordered the carbon content is 0.16 % max.
B By agreement the steel may be produced with titanium, in which case the minimum aluminum content shall not apply. When this option is exercised, the titanium content, by heat analysis, shall be 0.006 % to 0.02 %, and the actual titanium content shall be reported on the test report.
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Designation:A1066/A1066M −11
StandardSpecification for
High-Strength Low-Alloy Structural Steel Plate Produced by
Thermo-Mechanical Controlled Process (TMCP)
This standard is issued under the fixed designation A1066/A1066M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope system are not exact equivalents; therefore, each system is to
be used independently of the other, without combining values
1.1 This specification covers steel plates produced by the
in any way.
thermo-mechanical controlled process (TMCP). Five grades
are defined by the yield strength: 50 [345], 60 [415], 65 [450],
2. Referenced Documents
70 [485], and 80 [550]. The plates are intended primarily for
use in welded steel structures. 2.1 ASTM Standards:
A6/A6M Specification for General Requirements for Rolled
1.2 The TMCP method consists of rolling reductions and
Structural Steel Bars, Plates, Shapes, and Sheet Piling
cooling rate controls that result in mechanical properties in the
A673/A673M Specification for Sampling Procedure for Im-
finished plate that are equivalent to those attained using
pact Testing of Structural Steel
conventional rolling and heat treatment processes, which entail
reheating after rolling. A description of the TMCP method is
3. General Requirements for Delivery
given in Appendix X1.
3.1 Material furnished under this specification shall con-
1.3 The maximum thicknesses available in the grades cov-
form to the applicable requirements of the current edition of
ered by this specification are shown in Table 1.
Specification A6/A6M.
1.4 Due to the special combination of mechanical and
thermal treatment inducing lower rolling temperatures than for
4. Materials and Manufacture
conventional hot rolling the plates can not be formed at
4.1 The steel shall be killed.
elevated temperatures without sustaining significant losses in
4.2 The plates shall be produced by the thermo-mechanical
strength and toughness. The plates may be formed and post-
controlled process.
weld heat-treated at temperatures not exceeding 1050°F
[560°C]. Higher temperatures may be possible if proven that
5. Chemical Composition
minimum mechanical characteristics are retained after tests
with specimens in the post-weld heat treatment (PWHT)
5.1 The chemical composition on heat analysis shall con-
condition. For flame straightening higher temperatures can be
form to the requirements given in Table 1.
used in accordance with the steel manufacturer’s recommen-
5.2 The steel shall conform on product analysis to the
dations.
requirements prescribed in Table 1 subject to the product
1.5 If the steel is to be welded, a welding procedure suitable
analysis tolerances in Specification A6/A6M.
for the grade of steel and intended use or service is to be
5.3 The carbon equivalent on heat analysis shall not exceed
utilized. See Appendix X3 of Specification A6/A6M for
the limits listed in Table 2. The chemical analysis (heat
information on weldability.
analysis) of the elements that appear in the carbon equivalent
1.6 Supplementary requirements are available but shall
formula and the actual carbon equivalent shall be reported. For
apply only if specified in the purchase order.
the calculation of the carbon equivalent the following formula
shall be used:
1.7 The values stated in either inch-pound-units or SI units
are to be regarded separately as standard. Within the text, the Mn Cr1Mo1V Cu1Ni
~ ! ~ !
CE 5 C1 1 1
SI units are shown in brackets. The values stated in each
6 5 15
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee For referenced ASTM standards, visit the ASTM website, www.astm.org, or
A01.02 on Structural Steel for Bridges, Buildings, Rolling Stock and Ships. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved July 1, 2011. Published August 2011. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
A1066_A1066M-11. the ASTM website.
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A1066/A1066M−11
TABLE 1 Chemical Requirements (Heat Analysis)
Content in [%]
Element
Grade 50 [345] Grade 60 [415] Grade 65 [450] Grade 70 [485] Grade 80 [550]
Max 4 in. Max 4 in. Max 3 in. Max 2 in. Max 1 in.
Thickness
[100 mm] [100 mm] [75 mm] [50 mm] [25 mm]
A
Carbon, max 0.14 0.16 0.16 0.16 0.16
Manganese 0.70–1.60 0.80–1.70 0.80–1.70 0.80–1.70 1.00–2.00
Phosphorus, max 0.030 0.030 0.030 0.030 0.030
Sulfur, max 0.020 0.020 0.020 0.020 0.020
Silicon 0.15–0.50 0.15–0.50 0.15–0.50 0.15–0.50 0.15–0.50
Copper, max 0.35 0.35 0.35 0.35 0.35
Nickel, max 0.30 0.70 0.70 0.70 0.70
Chromium, max 0.30 0.30 0.30 0.35 0.40
Molybdenum 0.10 0.20 0.25 0.30 0.40
Columbium, max 0.05 0.05 0.05 0.05 0.10
Vanadium, max 0.08 0.008 0.08 0.09 0.09
Aluminium, min 0.020 total or 0.020 total or 0.020 total or 0.020 total or 0.020 total or
B B B B B
0.015 soluble 0.015 soluble 0.015 soluble 0.015 soluble 0.015 soluble
Boron, max 0.002 0.002 0.002 0.002 0.002
A
When Supplementary Requirement S75 is ordered the carbon content is 0.16% max.
B
Byagreementthesteelmaybeproducedwithtitanium,inwhichcasetheminimumaluminumcontentshallnotapply.Whenthisoptionisexercised,thetitaniumcontent,
by heat analysis, shall be 0.006% to 0.02%, and the actual titanium content shall be reported on the test report.
TABLE 2 Maximum Carbon Equivalent (Heat Analysis)
Maximum Carbon Equivalent in [%]
Grade 50 [345] Grade 60 [415] Grade 65 [450] Grade 70 [485]
...
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