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application: boiler, superheater and heat-exchanger. production standard, grade, steel no: astm a213 t11, t12, t22, t5, t9 astm a335 p11, p12, p22, p5, p9 astm a199 t11, t22, t5 astm a209 t1, t1a, t1b en10216-2 10crmo5-5, 11crmo9-10, x11crmo5+1, tc1, tc2 jis g3462 stba 12, stba13...
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