T9074-BD-GIB-010_0300_18_December_2012_Table_D-1.pdf

T9074-BD-GIB-010/0300

REVISION 2

NAVSEA TECHNICAL PUBLICATION

BASE MATERIALS FOR CRITICAL APPLICATIONS:

REQUIREMENTS FOR LOW ALLOY STEEL PLATE,

FORGINGS, CASTINGS, SHAPES, BARS, AND HEADS

OF HY-80/100/130 AND HSLA-80/100

THIS REVISION SUPERSEDES T9074-BD-GIB-010/0300 REVISION 1 DATED 16 JULY 2012.

DISTRIBUTION STATEMENT A: APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED.

PUBLISHED BY DIRECTION OF COMMANDER, NAVAL SEA SYSTEMS COMMAND

18 DECEMBER 2012

karen.dresbach Stamp

T9074-BD-GIB-010/0300 Rev 2

D-1

APPENDIX D (23008)

STEEL CASTINGS, ALLOY, HIGH YIELD STRENGTH

(HY-80 AND HY-100)

D.1 SCOPE.

D.1.1 Scope. This appendix covers Grade HY-80 and Grade HY-100 steel castings intended for critical structural applications where a weldable, notch-tough, high-strength material is required.

D.1.2 Classification. Steel castings shall be of the following grades, as specified (see D.6.2).

Grade HY-80 - 80,000 lb/in2 (80 ksi) [552 MPa] tensile yield strength, minimum.

Grade HY-100 - 100,000 lb/in2 (100 ksi) [690 MPa] tensile yield strength, minimum.

D.2 APPLICABLE DOCUMENTS.

See Chapter 2.

D.3 REQUIREMENTS.

D.3.1 Material. Castings shall be produced from electric furnace steel, which will be capable of producing the quality requirements of the first article castings, and the requirements of all procurement documents thereafter. Additional refining processes (AOD, VOD) may be specified (see D.6.2) to produce steel of acceptable quality.

D.3.2 Chemical Composition. The chemical composition of the heat analysis shall be in accordance with Table D-1.

Product analysis shall conform to Table D-1 as modified by the product analysis tolerances specified in ASTM A703.

D.3.2.1 Chaplets and Chills. When chaplets are used, they shall be composed of material as specified in Table D-1 or removed and weld repaired. Internal chills shall not be used without NAVSEA approval.

D.3.3 Thickness Definition.

a. The casting thickness (CT) shall be defined as the diameter of the greatest inscribed sphere in the as-cast part envelope to the exclusion of rigging and risers.

b. The heat treated thickness (T) shall be defined as the diameter of the greatest inscribed sphere at any location in the casting when heat treated for mechanical properties.

T9074-BD-GIB-010/0300 Rev 2

D-2

Table D-1. Chemical Composition (Weight Percent). 1/

Element Weight Percent (single values are maximums)

Grade HY-80 Grade HY-100 Carbon 0.20 0.22

Manganese 0.55 – 0.75 Phosphorus 0.014

Sulfur 0.005 Silicon 0.50 Nickel 2.75 – 3.25 3.00 – 3.50

Chromium 1.35 – 1.65 Molybdenum 0.30 – 0.60 Vanadium 2/ 0.03 Titanium 2/ 0.02 Copper 2/ 0.25 Arsenic 2/ 0.025

Tin 2/ 0.03 Antimony 2/ 0.025

Aluminum 0.04 Nitrogen 100 ppm 3/

NOTES:

1/ For definition of lot for heat analysis, see D.4.4.1.2 and D.4.4.2.

2/ Elements shall not be intentionally added.

3/ Nitrogen content shall be determined with samples and instrumentation in accordance with ASTM E1019 or by other NAVSEA approved method. Nitrogen analysis may be performed during refining, in the ladle, or from samples removed from the final product.

D.3.4 Tensile Properties. The material shall meet the tensile property requirements as specified in Table D-2 after all heat treatments including, when approved by NAVSEA (see D.3.7.c), stress relief. Tensile properties shall meet the requirements in Table D-2 at any location in the first article casting at an equivalent depth below the heat treated surface as the location of the tensile specimens in the prolongation or test block (see D.4.3.2.2).