4145 QT Alloy Steel Cold Bar 140 mm Round
4145 quenched-and-tempered alloy steel bar, cold-finished 140 mm diameter for drill collars and heavy shafts. HTS 7228.50.5040 applies to cold-formed alloy bars 76-228 mm, not further worked despite QT condition. Alloy via Cr-Mo content.
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Import Tips & Compliance
• QT heat treatment allowed if surface remains cold-finished only, not machined
• Certify 4145 chemistry distinctly from 4140 for proper alloy identification
• Oilfield applications may trigger special documentation requirements
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