ASTM A867:19 pdf download

ASTM A867:2019 pdf download.Standard Specification for lron-Silicon Relay Steels.
3. Ordering Information
3. 1 Orders to this specification shall include as much of the following information as is required to describe the desired steel:
3.1.1 ASTM Specification number and steel type,
3. 1.2 Dimensions and tolerances. The tolerances are to be mutually agreed upon between the user and the producer,
3. 1.3 Quantity (weight or number of pieces),
3.1.4 Form and condition,
3.1.5 Magnetic property requirements if they are otherwise than stated herein,
3.1.6 Certification of chemical analysis or magnetic property evaluation, or both.
3.1.7 Marking and packaging,
3. 1 .8 End Use—Whenever possible the user should specify whetherthe product will be machined, blanked into flat pieces, blanked and formed, or deep drawn to shape. This information will help the producer provide the most suitable product for the user’s fabrication practice.
3.1.9 Exceptions to this specification or special requirements.
4. Chemical Composition
4.1 The chemical composition requirements are shown in Table 1. Since magnetic and, possibly, mechanical properties are of primary importance, variations in composition from those shown in Table 1 are permitted by mutual agreement between the user and the producer.
5. Form and Condition
5. 1 As the silicon content increases, cold working becomes more difficult, hence, not all product forms are available in each type of steel. The desired form and condition should be specified and discussed with the producer to assure receiving the appropriate product. Available forms and conditions are:
5. 1. 1 Forging Billet (all steel types)—Billct surface ground. grit blasted, or acid cleaned.
6.Magnetic Property Requirements
6.1 Under this specification, only the coercive field strength(HcB) is required to be measured. This measurement can bedone either using ring or permeameter methods or by use of acoercimeter. Since coercimeters saturate the test specimenbefore measurement of the coercive field strength, two differ-ent sets of requirements are necessary，one for ring andpermeameter testing and one for coercimeter testing.
6.2 Test Specimen Heat Treatment—The test specimen shallbe heat treated before testing as follows; heat at 845C±10°C(1553°F ±18°F) for 4 hours in a wet hydrogen atmosphere(dew point of -20C to 5°C (-4F to 41F)) then cool at a rateof 50°C to 100°C per hour (122°F to 212°F per hour) to atemperature less than 540C (1000°F) followed by furthercooling at any convenient rate. For heat treatment of Type 3steels, dry hydrogen (dew point less than -40°C (-40°F)) shallbe used instead of wet hydrogen.