JIS 3445 steel kav yog tsim rau tshuab, tsheb, tsheb kauj vab, rooj tog, khoom siv thiab lwm yam khoom siv. Cov qib tseem ceeb yog STKM11A, STKM12(A,B,C), STKM12(A,B,C), STKM(A,B,C).
Lub Chemical Composition ntawm JIS 3445 STKM11, STKM12, STKM13 thiab STKM14 Mechanical Tubes yog raws li cov lus hauv qab no:
| Qib | Tshuaj muaj pes tsawg leeg% | |||||
| C | Si | Mn | P | S | Nb sau V | |
| STKM11A | Tsawg dua lossis sib npaug rau 0.12 | Tsawg dua lossis sib npaug rau 0.35 | Tsawg dua lossis sib npaug rau 0.60 | Tsawg dua lossis sib npaug rau 0.040 | Tsawg dua lossis sib npaug rau 0.040 | ▾ |
| STKM12A | Tsawg dua lossis sib npaug rau 0.20 | Tsawg dua lossis sib npaug rau 0.35 | Tsawg dua lossis sib npaug rau 0.60 | Tsawg dua lossis sib npaug rau 0.040 | Tsawg dua lossis sib npaug rau 0.040 | - |
| STKM12B | ||||||
| STKM12C | ||||||
| STKM13A | Tsawg dua lossis sib npaug rau 0.25 | Tsawg dua lossis sib npaug rau 0.35 | 0.30~ 0.90 |
Tsawg dua lossis sib npaug rau 0.040 | Tsawg dua lossis sib npaug rau 0.040 | - |
| STKM 13B | ||||||
| STKM13C | ||||||
| STKM14A | Tsawg dua lossis sib npaug rau 0.30 | Tsawg dua lossis sib npaug rau 0.35 | 0.30~ 1.00 |
Tsawg dua lossis sib npaug rau 0.040 | Tsawg dua lossis sib npaug rau 0.040 | - |
| STKM 14B | ||||||
| STKM14C | ||||||
Cov cuab yeej cuab tam ntawm JIS 3445 STKM11, STKM12, STKM13 thiab STKM14 Carbon Steel Mechanical Tubing yog raws li cov lus hauv qab no:
| Qib | Mechanical Properties | Flattening Test | Bending Test | |||
| Tensile zog (MPa) |
Yield zog (MPa) |
Elongation (%) | Nyob deb nruab nrab qhov chaw (D=OD) |
Khoov Lub kaum sab xis |
Sab hauv Radius (D=OD) |
|
| No.11: Qauv | ||||||
| STKM11A | 230 (294) |
- | 235 | 1/2D | 180 degree | 4D |
| STKM12A | 235 (343) |
218 (177) |
235 | 2/3D | 90 degree | 6D |
| STKM12B | 240 (392) |
228 (275) |
225 | 2/3D | 90 degree | 6D |
| STKM12C | 248 (471) |
236 (353) |
220 | - | - | - |
| STKM13A; | 238 (373) |
222 (216) |
230 | 2/3D | 90 degree | 6D |
| STKM 13B | 245 (441) |
231 (304) |
220 | 3/4D | 90 degree | 6D |
| STKM13C | 252 (510) |
239 (382) |
215 | - | - | - |
| STKM14A | 242 (412) |
225 (245) |
225 | 3/4D | 90 degree | 6D |
| STKM 14B | 251 (500) |
236 (353) |
215 | 7/8D | 90 degree | 8D |
| STKM14C | 256 (549) |
242 (412) |
215 | - | - | - |
Tolerances ntawm JIS G3445 STKM12A / STKM12B Tube nyob rau sab nraud:
Tsis muaj 1: thaum sab nraud txoj kab uas hla<50mm, tolerance 0.5mm;when outer diameter ≥50 mm,tolerance +/- 0.1mm;
Tsis muaj 2: thaum sab nraud txoj kab uas hla<50mm, tolerance 0.25mm;when outer diameter ≥50 mm,tolerance +/- 0.5mm;
Tsis muaj 3: thaum sab nraud txoj kab uas hla<25mm, tolerance 0.12mm;when 25mm ≤od ≥40 mm,tolerance +/- 0.15mm;
thaum 40mm Tsawg dua los yog sib npaug rau od Ntau tshaj lossis sib npaug rau 50 hli, kam rau ua +/- 0.18mm.
