Jis g3445Doimiy mashina va uskunalar, avtoulovlar, velosipedlar, mebel, jihozlarda ishlatiladigan uglerod po'lat naychalariga qo'llaniladi.
Jis 3445 mexanik po'lat naychasining spetsifikatsiyasi quyida keltirilgan:
STKMM11A, STKM12 (A, B, C), STKM13 (A, B, C), STKm14 (A, B, C)
OD: 19.05MM ~ 114,3 mm
WT: 2.0MM ~ 14 mm
Uzunlik: maksimal 16000mm
Jis G3445 mexanik naycha ishlab chiqarish usuli quyidagicha bo'lishi kerak:
Issiq tugagan po'latsiz po'latlamay naycha - -
Sovuq tugadi po'latsiz po'lat naychani - - c
ERW po'lat naychasi - e - g
Issiq tugatilgan erw po'lat naychasi - e -
Sovuq tugadi - e - c
Butt - payvandlangan po'lat naychasi - b
Sovuq tugadi {{0} - b - c
STKM11, STKM12, STKM13 va STKM14 ning kimyoviy tarkibi quyidagi jadvalda:
| Baho | Kimyoviy tarkib% | |||||
| C | Si | Mn | P | S | Nb yoki v | |
| Stkm11a | 0,12 dan kam yoki teng | 0,35 dan kam yoki teng | 0,60 dan kam yoki unga teng | 0,040 dan kam yoki unga teng | 0,040 dan kam yoki unga teng | ▾ |
| STKM12A | 0,20 dan kam yoki unga teng | 0,35 dan kam yoki teng | 0,60 dan kam yoki unga teng | 0,040 dan kam yoki unga teng | 0,040 dan kam yoki unga teng | - |
| STKM12B | ||||||
| STKM12C | ||||||
| Stkm13a | 0,25 dan kam yoki unga teng | 0,35 dan kam yoki teng | 0.30~ 0.90 |
0,040 dan kam yoki unga teng | 0,040 dan kam yoki unga teng | - |
| STKM13b | ||||||
| STKM13C | ||||||
| STKM14A | 0,30 dan kam yoki teng | 0,35 dan kam yoki teng | 0.30~ 1.00 |
0,040 dan kam yoki unga teng | 0,040 dan kam yoki unga teng | - |
| STKM14B | ||||||
| STKM14C | ||||||
STKM11, STKM12, STKM13 va STKM14ning mexanik xususiyatlari quyidagi jadvalda:
| Baho | Mexanik xususiyatlar | Test sinovi | Betish testi | |||
| Mustahkamlik chegarasi (MPA) |
Kuch berish kuchi (MPA) |
Cho'zish (%) | Masofa orasida bu qismlar (D = |
Bukmoq Burchak |
Ichkarida Radius (D = |
|
| No 11: namuna | ||||||
| Stkm11a | 230 (294) |
- | 235 | 1/2D | 180 daraja | 4D |
| STKM12A | 235 (343) |
218 (177) |
235 | 2/3D | 90 daraja | 6D |
| STKM12B | 240 (392) |
228 (275) |
225 | 2/3D | 90 daraja | 6D |
| STKM12C | 248 (471) |
236 (353) |
220 | - | - | - |
| Stkm13a; | 238 (373) |
222 (216) |
230 | 2/3D | 90 daraja | 6D |
| STKM13b | 245 (441) |
231 (304) |
220 | 3/4D | 90 daraja | 6D |
| STKM13C | 252 (510) |
239 (382) |
215 | - | - | - |
| STKM14A | 242 (412) |
225 (245) |
225 | 3/4D | 90 daraja | 6D |
| STKM14B | 251 (500) |
236 (353) |
215 | 7/8D | 90 daraja | 8D |
| STKM14C | 256 (549) |
242 (412) |
215 | - | - | - |
Jis g3445 stkm12a / stkm12b naychasining tashqi diametri:
Yo'q 1: tashqi diametri qachon<50mm, tolerance 0.5mm;when outer diameter ≥50 mm,tolerance +/- 0.1mm;
Yo'q 2: tashqi diametri qachon<50mm, tolerance 0.25mm;when outer diameter ≥50 mm,tolerance +/- 0.5mm;
Yo'q 3: tashqi diametri qachon<25mm, tolerance 0.12mm;when 25mm ≤od ≥40 mm,tolerance +/- 0.15mm;
40 mm dan katta yoki teng bo'lsa, 50 mm dan katta yoki unga teng bo'lsa, mm mm.






