ASTM A516 Marxaladda cadaadiska ee darajada 70
Awoodda ASTM A516 fasalka 70 wax yar ayay ka sarraysaa Q245R, u dhaw laakiin in yar ka hoosaysa Q345R.
Inta badan smelter gudaha Shiinaha, dooro Q245R sida wax soo saarka.Marka hore, Q245R waxay leedahay cilladaha alxanka oo ka yar Q345R, taas oo lagu go'aamiyo halabuurka kiimikada.Intaa waxaa dheer, Q245R ayaa ka fiican Q345R ee iska caabinta daxalka hydrogen.
Waxyaabaha ugu muhiimsan ee kiimikaad ee saameeya daxalka hydrogen sulfide waa Mn iyo s.Habka wax soo saarka birta iyo alxanka qalabka, manganese waxay soo saartaa xoog sare iyo qallafsanaan hooseeya ee martensite / bainite, taas oo muujinaysa qallafsanaan aad u sarreeya, taas oo ah mid aad u aan fiicnayn qalabka si looga hortago daxalka hydrogen sulfide.Intaa waxaa dheer, ku darida aan biraha ahayn ee manganese sulfide iyo sulfide birta ayaa laga sameeyay birta, taasoo keentay dabacsanaan microstructure maxalliga ah iyo daxalka walaaca ee deegaanka qoyan ee hydrogen sulfide.
Shaxda1 Halabuurka Kiimikada
|
Qalabka Kiimikada (%)
|
|
C
|
Si
|
Mn
|
S
|
P
|
A516 Fasalka 70
|
0.27-0.31
|
0.13-0.45
|
0.79-1.30
|
≤0.035
|
≤0.035
|
Q245R
|
≤0.2
|
≤0.35
|
0.5-1.0
|
≤0.01
|
≤0.025
|
Q345R
|
≤0.2
|
0.2-0.55
|
1.2-1.6
|
≤0.01
|
≤0.025
|
Q245R (HIC)
|
≤0.2
|
≤0.35
|
0.5-1.0
|
≤0.004
|
≤0.015
|
Q345R (HIC)
|
≤0.2
|
0.2-0.55
|
1.2-1.6
|
≤0.004
|
≤0.015
|
Table2 Property Mechanical Property
|
Halka makaanikada
|
|
Xoogga Xidhiidhka (MPa)
|
Awoodda Wax-soosaarka
(MPa)
|
% Kordhinta50mm (daqiiqo)
|
dhuudhka
|
A516 Fasalka 70
|
485-620
|
260
|
17
|
36-60mm
|
Q245R
|
400-520
|
225
|
25
|
Q345R
|
490-620
|
315
|
21
|
Fiiro gaar ah: saxan bir ah oo adkaysi u leh HIC
1.Waxyaalaha P iyo S oo hooseeya, iska caabin wanaagsan u leh daxalka hydrogen sulfide qoyan;
2.Tijaabada waxqabadka dildilaaca hydrogen-ka (HIC), habka imtixaanku waxa uu waafaqsan yahay heerka NACE TM0284 ama GB/T 8650;
3.Iska caabin heer sare ah oo ka dhan ah waxqabadka sulfide stress corrosion (SSCC).