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无锡无缝钢管st52是什么材质
st52相当于Q345B，或者16mn
化学成分如下：
Chemical composition
C <=0.20
Si <=0.55
Mn <=1.60
P <=0.030
S <=0.030
Cu <=0.55
N <=0.012
Material Number
1.0553
Steel group
Non alloy quality steels: Steels with average C > 0,25 < 0,55 % or Rm > 500 < 700 N/mm²
Symbol
S355J0; St 52-3 U †
Standards
DIN EN 10025-2 (04/2005)
Hot rolled products of structural steels. Technical delivery conditions for non-alloy structural steels.
International conformity
EN 10025-2 (2004)
Replaces
DIN EN 10025-2 (02/2005); DIN EN 10025 (03/1994); DIN EN 10113-2 (04/1993)
Way of deoxydation: rimmed is not permitted
With special cold workability: 1.0554; S355J0C
Former designation DIN 17100: St 52-3 U
Former designation of steels with special working properties,
Cold flanging: 1.0573; QSt 52-3 U
Cold drawing: 1.0597; ZSt 52-3 U
Cold roll forming: 1.0575; KSt 52-3 U
“目前保生产仍是钢厂第一要务，在钢材利润降至盈亏平衡点之前，钢厂是不可能降安全库存的。港口库存流通量只有6000万吨，而正是这6000万吨贸易矿，决定着1.4亿吨铁矿石的价格。根据供需推算，港口贸易矿规模有可能持续下降，同时贸易矿分布在各个港口的各个品种，贸易矿规模下降给大贸易商囤货并获得定价权提供了便利。”
