一、Q550CFC鋼板尺寸、外形、重量及允許偏差
鋼板的尺寸、外形、重量及允許偏差應(yīng)符合GB/T709的規(guī)定。
經(jīng)供需雙方協(xié)議,也可供應(yīng)其他尺寸、外形及允許偏差的鋼板
N類偏差:正偏差負(fù)偏差相等
A類偏差:按公稱厚度決定正偏差
B類偏差:固定負(fù)偏差為0.3
C類偏差:固定負(fù)偏差為0、按公稱厚度決定正偏差
二、Q550CFC鋼板執(zhí)行標(biāo)準(zhǔn):YB/T4137-2013.
三、Q550CFC鋼板探傷:(Ⅰ、Ⅱ、Ⅲ級(jí)類探傷)
探傷:也叫超聲波檢驗(yàn),是針對(duì)鋼板內(nèi)部重量的一種檢驗(yàn)方法及手段,可以檢驗(yàn)港版的內(nèi)部缺陷。
根據(jù)需方要求,經(jīng)供需雙方協(xié)商,鋼板可進(jìn)行超聲波檢測(cè),檢測(cè)方法按GB/T2970或JB/T4730.3,檢驗(yàn)方法和合格級(jí)別應(yīng)在合同中注明。
四、
Q550CFC steel plate smelting process
Steel is smelted in a converter or an electric furnace and shall be refined outside the furnace;The delivery state of Q550CFC steel plate shall be thermomechanically controlled rolling (TMCP), TMCP+ tempering or quenching + tempering (quenching and tempering). The specific delivery state shall be agreed by both parties and indicated in the contract.Steel plates shall be delivered by cutting or flame cutting
Note: Tempering and quenching analysis
Tempering: To hold the steel plate at a certain appropriate temperature for a long time before cooling
Quenching: is to heat the steel plate after heat preservation in water oil or other inorganic salts and other media for rapid cooling
五、Q550CFC鋼板化學(xué)成分
Q550CFC鋼的化學(xué)成分(熔煉分析)應(yīng)符合下表的規(guī)定(%)
Q550CFC化學(xué)成分要求
C
Si
Mn
P
S
Cr
Ni
Mo
V
Nb
Ti
B
≤0.09
≤0.5
≤2.0
≤0.02
≤0.01
≤0.8
≤1.8
≤0.7
≤0.1
≤0.12
≤0.05
≤0.005
六、Q550CFC鋼板焊接裂紋敏感性指數(shù)(不大于)Pcm/%
鋼牌號(hào)
產(chǎn)品厚度
名稱
≤50
50-60
60-75
75-100
Q550CFC
0.25
0.25
0.28
0.30
七、Q550CFC鋼板機(jī)械性能
Q550CFC的力學(xué)性能和工藝性能能應(yīng)符合下表規(guī)定:
Q550CFC力學(xué)性能要求(適用于橫向)
牌號(hào)
拉伸試驗(yàn)
彎曲試驗(yàn)
夏比V型沖擊試驗(yàn)
上屈服強(qiáng)度
抗拉強(qiáng)度
斷后伸長(zhǎng)率
彎曲1800
溫度
沖擊吸收能量
厚度≤50
50-100
Q550CFC
550
530
670-830
16
d=3a
0
60
八、Q550CFC鋼板沖擊功