120KSI-STEEL-GRADE HIGH-STRENGTH HIGH-TOUGHNESS HIGH-HYDROGEN SULFIDE-RESISTANCE HOT-ROLLED STEEL ROUND BAR USED FOR DRILL PIPE JOINT, AND PREPARATION METHOD THEREFOR

WIPO Patent Application WO/2023/206818

A1

Disclosed in the present invention are a 120ksi-steel-grade high-strength high-toughness high-hydrogen sulfide-resistance hot-rolled steel round bar used for a drill pipe joint, and a preparation method therefor. The chemical components of said steel comprise, by mass, 0.20-0.30% of C, 0.15-0.35% of Si, 0.45-0.75% of Mn, 1.10-1.50% of Cr, 0.60-0.80% of Mo, 0.020-0.060% of Nb, ≤0.008% of P, and ≤0.003% of S, with the balance being Fe and inevitable impurities. The preparation method comprises: electric furnace, LF refining, vacuum degassing (VD), high-precision continuous casting, steel billet inspection, heating furnace temperature controlled heating, rough rolling, horizontal and vertical alternating high-precision continuous rolling, collection on a cooling bed, and finished product inspection. The hot-rolled steel round bar for a drill pipe joint has high strength, high toughness and strong hydrogen sulfide stress corrosion resistance and can be used for development of acidic oil and gas fields.

TAN YAZE (CN)
XU XIAOCHUN (CN)
CHEN XINGHUA (CN)
WEN HUI (CN)
WANG DEJIONG (CN)
DENG WEI (CN)

PCT/CN2022/105183

November 02, 2023

July 12, 2022

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NANJING IRON & STEEL CO LTD (CN)

C22C38/22; B21B1/02; C22C33/04; C22C38/02; C22C38/04; C22C38/26; C22C38/38

CN102140611A	2011-08-03
CN102251189A	2011-11-23
CN104975235A	2015-10-14
CN102330027A	2012-01-25
CN102409240A	2012-04-11
US20020104592A1	2002-08-08

NANJING SUGAO PATENT AND TRADEMARK FIRM ( ORDINARY PARTNERSHIP ) (CN)

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