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Mechanical Properties
[Tension Tests]
1.Requirements------The material shall conform to requirements for tensile properties in Table 2.
1.1.The test specimen shall be obtained from a rough or finished forging,or prologation thereof.For forgings under 10 000IBs,at time of heat treatment,it may be obtained from separately forged test blanks from the same heat of steel as the production forgings,The test blank shall be reduced by forging in a manner similar to that for the products represented,and shall receive approximately the same hot working and reduction and the same heat treatment as the finished products represented.The test material shall be treated in the same furnace at the same time as the forging it represents,subject to the requirements of 7.1.2.1.
1.2.The test specimen shall represent all forgings from the same heat and heat-treatment load whose maximum thicknesses do not exceed the thickness of the test forging or blank by more than 1/4 in.[6 mm].
2.Numver of tests----One tension test at room temperature shall be made in accordance with 7.1.1.2 from each heat in each heat-treatment load.
2.1.If heat treatment is performed in either a continuous or a batch-type furnace controlled within ±25 °F[±14 ℃] of the required heat-treatment temerature and equipped with recording pyrometers so that complete records of heat threatment are available and if the same heat-treating cycles are used on the forgings represented by the tension test,then one tension test from each heat shall be required,instand of one tension test from each heat in each heat treatment load in accordance with 7.1.1.2.
third party inspection
[Hardness Test]
Except when only one forging is produced,a minimum of two forgings shall be hardness tested per batch or continuous run as defined in 7.1.2.1 to ensure that hardness of the forgings does not exceed 197 HBW after heat treatment for mechanical properties.The hardness measurements shall be made as specified in Specification A961/A961M.When only one forging is produced,it shall be hardness tested to ensure than is meets the 197HBW maximum of this specification.The pruchaser may verify that this requirement has been met by testing at any location on the forging,provided that such testing does not render the forging useless
Chemical Requirements
| Element | Composition.wt.% | |||
| Grade Lf1 | Grade LF2 | Grade LF3 | Grade LF3 | |
| Carbon,max | 0.30 | 0.30 | 0.20 | 0.30 |
| Manganese | 0.60-1.35 | 0.60-1.35 | 0.90,max | 0.60-1.35 |
| Phosphorus,max | 0.035 | 0.035 | 0.035 | 0.035 |
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