JIS 3445 po'lat quvurlari mashinalar, avtomobillar, velosipedlar, mebellar, jihozlar va boshqa mexanik qismlarga mos keladi. Asosiy navlar: STKM11A, STKM12(A,B,C), STKM12(A,B,C), STKM(A,B,C).
JIS 3445 STKM11, STKM12, STKM13 va STKM14 mexanik quvurlarining kimyoviy tarkibi quyidagi jadvalda keltirilgan:
| Baho | Kimyoviy tarkibi % | |||||
| C | Si | Mn | P | S | Nb yoki V | |
| STKM11A | 0 dan kichik yoki unga teng.12 | 0 dan kichik yoki unga teng.35 | 0 dan kichik yoki unga teng.60 | 0 dan kichik yoki unga teng.040 | 0 dan kichik yoki unga teng.040 | ▾ |
| STKM12A | 0 dan kichik yoki unga teng.20 | 0 dan kichik yoki unga teng.35 | 0 dan kichik yoki unga teng.60 | 0 dan kichik yoki unga teng.040 | 0 dan kichik yoki unga teng.040 | - |
| STKM12B | ||||||
| STKM12C | ||||||
| STKM13A | 0 dan kichik yoki unga teng.25 | 0 dan kichik yoki unga teng.35 | 0.30~ 0.90 |
0 dan kichik yoki unga teng.040 | 0 dan kichik yoki unga teng.040 | - |
| STKM13B | ||||||
| STKM13C | ||||||
| STKM14A | 0 dan kichik yoki unga teng.30 | 0 dan kichik yoki unga teng.35 | 0.30~ 1.00 |
0 dan kichik yoki unga teng.040 | 0 dan kichik yoki unga teng.040 | - |
| STKM14B | ||||||
| STKM14C | ||||||
JIS 3445 STKM11, STKM12, STKM13 va STKM14 karbonli po'latdan yasalgan mexanik quvurlarning mexanik xususiyatlari quyidagi jadvalda keltirilgan:
| Baho | Mexanik xususiyatlar | Yassilash testi | Bükme testi | |||
| Mustahkamlik chegarasi (MPa) |
Hosildorlik kuchi (MPa) |
Uzayish (%) | Masofa orasida bu qismlar (D=OD) |
Bukish Burchak |
Ichkarida Radius (D=OD) |
|
| № 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% 3b | 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 trubkasining tashqi diametrdagi tolerantliklari:
№ 1: tashqi diametri qachon<50mm, tolerance 0.5mm;when outer diameter ≥50 mm,tolerance +/- 0.1mm;
№ 2: tashqi diametri bo'lganda<50mm, tolerance 0.25mm;when outer diameter ≥50 mm,tolerance +/- 0.5mm;
№ 3: tashqi diametri bo'lganda<25mm, tolerance 0.12mm;when 25mm ≤od ≥40 mm,tolerance +/- 0.15mm;
40 mm od dan kichik yoki teng bo'lganda 50 mm dan katta yoki unga teng, bardoshlik +/- 0,18 mm.
