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Cold Rolled Steeldhsteel.co.kr/bbs/data/dhsteel_pd/CR.pdf3. 인장시험및연신율은폭30mm 이상에적용. 4. 두께0.6mm미만은 원칙적으로인장시험생략. 5. 3종의표준조질에비시효성의지정이있는경우는제조공장출하후6개월간비시효성보증.
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