Raw material from POSCO
1,Size accuracy
The outside path admission deviation that solder take care of includes the elliptical park a cent Ⅰ , Ⅱ two class, see the table 3, table 4. ⅠOutside path in class deviation mm table 3Outside path inⅡ class deviation mm table 4 Outside pathAdmission deviation<25±0.10≥25~38.1±0.15>38.1~50±0.20≥50~63.50.25>63.5~76±0.30≥76~102±0.40 Outside pathAdmission deviation≤10±0.15>10~32±0.20>32~50±0.30>50±0.8%
The thick the deviation of admission( do not include the weld sew) in wall of the weld tube is for ruling the wall thick 10% of ±, but minimum admission deviation is the 0.02 mms of ±.
The weld takes care of of settle Chinese foot length as 3 ms~9 ms, general settle the Chinese foot with the 6 ms.The weld takes care of of settle the Chinese foot length in usually length, its the deviation of admission is the 5 mms of ±.
Adopt partial the degree of flinch in a the tube of weldfor keeping the Chinese foot measurement should not very in 2.0 mms.
2,The machine function sees the table 5
table 5 Steel numberCard numberThe heat handles
Make degree
The anti- pulls the strength
MPaAccept defeat the strength
MPaExtension rate%Degree of hardnessHRB0Cr19N19304≥1010°C
Nasty and cold≥520≥20540≤9000Cr19Ni11304L" "≥480≥17540≤900Cr17Ni12M02316" "≥520≥20540≤900Cr17Ni14M02316L" "≥480≥17540≤900Cr18Ni11Ti321≥920°C
Nasty and cold≥520≥20540≤90