NEW-ERA STEEL TUBE TECHNOLOGY CO.,LTD
NEW-ERA STEEL TUBE HOLDING NINGBO PIPEWAY TRADE CO.,LTD
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JIS G3445 STKM11A STKM12C STKM13C outer round inner oval shapped steel tubes for auto rubber bushing
Seamless Carbon and Alloy Steel Mechanical Tubing
Applications: For auto rubber bushing
Size range: O.D.:6-76mm W.T.:1-15mm L:max12000mm
Steel Grade JIS G3445 STKM11A,12C,13C or others,Chemical compisition:
Mechanical properties:
| JIS3445 | C | Si | Mn | P | S | Nb or V | Tention Test | Flateniug | Bendability | ||||
| Symbol | T.S. N/mm^2 | Y.P. N/mm^2 | Elongation | ||||||||||
| No 4,11,12 Test pe | No 4,5 Test pe | Distance Between Flatened Plates | Band Angle | Inside Radius | |||||||||
| STKM11A | 0.12 max. | 0.35 max. | 0.60 max. | 0.040 max. | 0.040 max. | . | 290 min. | . | 35 min. | 30 min. | 1/2D | 180 | 4 D |
| STKM12A | 0.20 max. | 0.35 max. | 0.60 max. | 0.040 max. | 0.040 max. | . | 340 min. | 175 min. | 35 min. | 30 min. | 2/3D | 90 | 6 D |
| STKM12B | 390 min. | 275 min. | 25 min. | 20 min. | 2/3D | 90 | 6 D | ||||||
| STKM12C | 470 min. | 355 min. | 20 min. | 15 min. | . | . | . | ||||||
| STKM13A | 0.25 max. | 0.35max. | 0.30 to 1.00 | 0.040 max. | 0.040 max. | . | 370 min. | 215 min. | 30 min. | 25 min. | 2/3D | 90 | 6 D |
| STKM13B | 440 min. | 305 min. | 20 min. | 15 min. | 3/4D | 90 | 6 D | ||||||
| STKM13C | 510 min. | 380 min. | 15 min. | 10 min. | . | . | . | ||||||
| STKM14A | 0.30 max. | 0.35 max. | 0.30 to 1.00 | 0.040 max. | 0.040 max. | . | 410 min. | 245 min. | 25 min. | 20 min. | 3/4D | 90 | 6 D |
| STKM14B | 500 min. | 355 min. | 15 min. | 10 min. | 7/8D | 90 | 8 D | ||||||
| STKM14C | 550 min. | 410 min. | 15 min. | 10 min. | . | . | . | ||||||
| STKM15A | 0.25 to 0.35 | 0.35 max. | 0.30 to 1.00 | 0.040 max. | 0.040 max. | . | 470 min. | 275 min. | 22 min. | 17 min. | 3/4D | 90 | 6 D |
| STKM15C | 580 min. | 430 min. | 12 min. | 17 min. | . | . | . | ||||||
| STKM16A | 0.35 to 0.45 | 0.40 max. | 0.40 to 1.00 | 0.040 max. | 0.040 max. | . | 510 min. | 325 min. | 20 min. | 15 min. | 7/8D | 90 | 8 D |
| STKM16C | 620 min. | 460 min. | 12 min. | 7 min. | . | . | . | ||||||
| STKM17A | 0.45 to 0.55 | 0.40 max. | 0.40 to 1.00 | 0.040 max. | 0.040 max. | . | 550 min. | 345 min. | 20 min. | 15 min. | 7/8D | 90 | 8 D |
| STKM17C | 650 min. | 480 min. | 10 min. | 5 min. | . | . | . | ||||||
| STKM18A | 0.18 max. | 0.55 max. | 1.50 max. | 0.040 max. | 0.040 max. | . | 440 min. | 275 min. | 25 min. | 20 min. | 7/8D | 90 | 6 D |
| STKM18B | 490 min. | 315 min. | 23 min. | 18 min. | 7/8D | 90 | 8 D | ||||||
| STKM18C | 510 min. | 380 min. | 15 min. | 10 min. | . | . | . | ||||||
| STKM19A | 0.25 max. | 0.55 max. | 1.50 max. | 0.040 max. | 0.040 max. | . | 490 min. | 315 min. | 23 min. | 18 min. | 7/8D | 90 | 6 D |
| STKM19C | 550 min. | 410 min. | 15 min. | 10 min. | . | . | . | ||||||
| /D | 0.25 max. | 0.55 max. | 1.60 max. | 0.040 max. | 0.040 max. | 0.15 max. | 540 min. | 390 min. | 23 min. | 18 min. | 7/8D | 90 | 6 D |
1. Thickness variation can’t lead the wall out the limit deviations concerning wall thickness.
2. In pipe cross-section the deviation from right angle can’t be more than ±1.5°.
3. Pipe curvature can’t be more than 2 mm for 1m of length.
Pipes are produced without adjustment, in this case curvature is not regulated.
1)About our factory:
2) Production equipments:
3) Testing equipments:
4) Export packing methods:
5)We have ISO9001/TS16949 certificates: