T/JSGT 005-2021 Active Group standards

T/JSGT 005-2021 Electric drill bits made of alloy tool steel

Publish Date: 2021-09-16 Implement Date: 2021-09-17 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/JSGT 005-2021

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Metallurgy

ICS Name: Tool steel

Publish Date: 2021-09-16

Implement Date: 2021-09-17

Scope

Main technical contents: (1) Grade and chemical composition: The steel grade and chemical composition (melt analysis) shall comply with the requirements in Table 1. Table 1: Grade and chemical composition Unit: % Grade Chemical composition (mass fraction) CSiMnPSCrMoVNiCuS2-M 0.65‚Äď0.70 1.00‚Äď1.20 0.40‚Äď0.60 ‚Č§0.020 ‚Č§0.015 0.20‚Äď0.40 0.40‚Äď0.50 0.10‚Äď0.18 0.10‚Äď0.16 ‚Č§0.25 The allowable deviation of the chemical composition of the finished steel shall comply with the provisions of GB/T 222. (2) Melting method: The steel is melted in a converter or electric furnace and subjected to external refining. Unless otherwise specified by the purchaser, the melting method is generally selected by the supplier. (3) Delivery condition: The wire rod is delivered in a hot-rolled state. (4) Non-metallic inclusions: The non-metallic inclusions shall be measured according to the A method described in ASTM E45. The acceptable grades are shown in Table 2. If the supplier can guarantee the quality, the inspection may be waived. Table 2: Acceptable grades of non-metallic inclusions Inclusion type Class A Class B Class C Class D Fine Coarse Fine Coarse Fine Coarse Acceptable grade ‚Č§2.0 ‚Č§1.5 ‚Č§2.0 ‚Č§1.5 ‚Č§1.0 ‚Č§1.0 ‚Č§1.5 ‚Č§1.5 (5) Decarburization layer: The surface of the wire rod shall not have a completely decarburized layer, and the total decarburized layer depth shall comply with the requirements in Table 3. Table 3: Acceptable grades of decarburization layer Unit: mm Nominal diameter D Total decarburized layer depth ő¶5.5‚Äď8.0 ‚Č§0.05 ő¶9.0‚Äď25.0 ‚Č§0.6%D (6) Microstructure: The microstructure of the wire rod shall be predominantly bainite, with a bainite proportion ‚Č•50%. (7) Surface quality: The surface of the wire rod shall not have cracks, inclusions, flaws, burrs, or folds that affect its use. Local point-like protrusions, pits, indentations, or p