S460QL1 va S690QL1 EN 10025-6 bo'yicha so'ndirilgan va qattiqlashtirilgan konstruktiv po'lat plitalardir. Belgilanish minimal oquvchanlikni belgilaydi (460 MPa va 690 MPa) va "QL1" qo'shimchasi past haroratlarda (masalan, -40 daraja yoki -60 daraja) kafolatlangan uzunlamasına (L1) zarba chidamliligi bilan Söndürülmüş (Q) va Temperlangan (T) holatini bildiradi. Ushbu navlar og'ir qurilish va tog'-kon mashinalari, dengiz inshootlari va ilg'or transport tizimlari kabi yuqori kuch va sinish qarshiligini talab qiluvchi yuqori kuchlanishli, muhim payvandlangan tuzilmalar uchun mo'ljallangan.
Asosiy farqlar:
Asosiy farq - bu kuchning sezilarli farqi. S460QL1 460 MPa, S690QL1 esa 690 MPa-50% ga ko'tarilish quvvatini ta'minlaydi. Bu S690QL1 ni haddan tashqari yuk koʻtarish qobiliyati-va maksimal vaznni kamaytirish muhim boʻlgan ilovalar uchun mos qiladi.
Achieving this ultra-high strength while retaining the stringent "QL1" toughness necessitates a fundamentally more advanced metallurgical approach for S690QL1. Its chemical composition involves significantly higher levels of carbon, manganese, and alloying elements like chromium, nickel, molybdenum, and boron. Consequently, S690QL1 has a dramatically higher carbon equivalent (Ceq) and crack susceptibility index compared to S460QL1. This translates to an exponential increase in fabrication complexity. Welding S690QL1 is exceptionally restrictive: it demands specially developed ultra-high-strength consumables, meticulous preheating (often >150 daraja), juda past issiqlik sarfi, oʻtish oraligʻidagi qattiq harorat nazorati va issiqlik taʼsirlangan hududda qattiqlikni tiklash va vodorod yorilishi-ning oldini olish uchun deyarli har doim payvanddan keyingi issiqlik bilan ishlov berish (PWHT) amalga oshiriladi.
Kimyoviy tarkibi
|
S460QL1Kimyoviy tarkibi |
||||||||
|
Baho |
Maksimal element (%) |
|||||||
|
C |
Si |
Mn |
P |
S |
N |
B |
Cr |
|
|
S460 QL1 |
0.20 |
0.80 |
1.70 |
0.020-0.025 |
0.010-0.015 |
0.015 |
0.005 |
1.50 |
|
Cu |
Mo |
Nb |
Ni |
Ti |
V |
Zr |
|
|
|
0.50 |
0.70 |
0.06 |
2.0 |
0.05 |
0.12 |
0.15 |
|
|
|
S690QL1Kimyoviy tarkibi |
||||||||
|
Baho |
Maksimal element (%) |
|||||||
|
C |
Si |
Mn |
P |
S |
N |
B |
Cr |
|
|
S690 QL1 |
0.20 |
0.80 |
1.70 |
0.020-0.025 |
0.010-0.015 |
0.015 |
0.005 |
1.50 |
|
Cu |
Mo |
Nb |
Ni |
Ti |
V |
Zr |
|
|
|
0.50 |
0.70 |
0.06 |
2.0 |
0.05 |
0.12 |
0.15 |
|
|
Mexanik xususiyat
|
Baho |
S460QL1Mexanik xususiyat |
|||||
|
Qalinligi |
Yo'l bering |
Kuchlanish |
Cho'zilish |
Minimal ta'sir energiyasi
|
||
|
S460 QL1 |
mm |
Min Mpa |
Mpa |
Min % |
-60 |
30J |
|
3<> |
460 |
550-720 |
17 |
-60 |
30J |
|
|
50<> |
440 |
550-720 |
17 |
-60 |
30J |
|
|
100<> |
400 |
500-670 |
17 |
-60 |
30J |
|
|
Baho |
S690QL1Mexanik xususiyat |
|||||
|
Qalinligi |
Yo'l bering |
Kuchlanish |
Cho'zilish |
Minimal ta'sir energiyasi
|
||
|
S690 QL1 |
mm |
Min Mpa |
Mpa |
Min % |
-60 |
30J |
|
3<> |
890 |
940-1100 |
11 |
-60 |
30J |
|
|
50<> |
830 |
880-1100 |
11 |
-60 |
30J |
|
|
100<> |
800 |
820-1000 |
11 |
-60 |
30J |
|
