Grades · 45#
45# Seamless Steel Pipe
Medium-carbon grade that machines predictably and responds well to quench and temper. The default choice when a part needs more strength than 20# can give but does not justify an alloy grade.
438
Sizes in stock
Φ95–635
OD range (mm)
15–140
Wall range (mm)
GB/T 8162
Standard
International equivalents
| Chinese standard | GB/T 8162 · GB/T 699 |
|---|---|
| Closest equivalent | AISI 1045 |
| Also comparable | EN C45 / 1.0503 |
| Also comparable | JIS S45C |
Typical properties
| Tensile strength | ≥ 600 MPa (normalized, standard minimum) |
|---|---|
| Yield strength | ≥ 355 MPa (normalized, standard minimum) |
| Elongation | ≥ 16% |
| Hardenability | Responds to Q&T; hardness to specified HB / HRC |
Typical applications
- Shafts, spindles and hollow axles
- Gear and sprocket blanks machined from tube
- Machine frames and heavy structural parts
- Hollow bar replacement for solid round — saves roughing time
Delivery conditions
The delivery condition changes the material more than most buyers expect. Tell us what the part has to do and we will recommend one.
Hot rolledNormalizedQuenched & temperedAnnealed
45# sizes on the ground
438 combinations, updated 2026-08-22. Quantities turn over daily — confirm availability when you inquire.
| OD × Wall (mm) | OD (in) |
|---|---|
| Φ95 × 15 | 3.74″ |
| Φ95 × 23 | 3.74″ |
| Φ102 × 18 | 4.02″ |
| Φ102 × 20 | 4.02″ |
| Φ102 × 30 | 4.02″ |
| Φ108 × 18 | 4.25″ |
| Φ114 × 20 | 4.49″ |
| Φ127 × 26 | 5.00″ |
| Φ127 × 30 | 5.00″ |
| Φ140 × 34 | 5.51″ |
| Φ152 × 18 | 5.98″ |
| Φ152 × 20 | 5.98″ |
| Φ152 × 35 | 5.98″ |
| Φ159 × 24 | 6.26″ |
| Φ159 × 26 | 6.26″ |
| Φ159 × 30 | 6.26″ |
| Φ159 × 35 | 6.26″ |
| Φ168 × 15 | 6.61″ |
| Φ168 × 18 | 6.61″ |
| Φ168 × 30 | 6.61″ |
| Φ168 × 32 | 6.61″ |
| Φ168 × 42 | 6.61″ |
| Φ168 × 50 | 6.61″ |
| Φ178 × 20 | 7.01″ |
| Φ180 × 30 | 7.09″ |
| Φ180 × 32 | 7.09″ |
| Φ180 × 35 | 7.09″ |
| Φ180 × 40 | 7.09″ |
| Φ180 × 45 | 7.09″ |
| Φ180 × 50 | 7.09″ |
| Φ180 × 52 | 7.09″ |
| Φ180 × 55 | 7.09″ |
| Φ188 × 22 | 7.40″ |
| Φ188 × 25 | 7.40″ |
| Φ188 × 30 | 7.40″ |
| Φ194 × 20 | 7.64″ |
| Φ194 × 25 | 7.64″ |
| Φ194 × 28 | 7.64″ |
| Φ194 × 30 | 7.64″ |
| Φ194 × 35 | 7.64″ |
| Φ194 × 40 | 7.64″ |
| Φ194 × 50 | 7.64″ |
| Φ203 × 20 | 7.99″ |
| Φ203 × 26 | 7.99″ |
| Φ203 × 30 | 7.99″ |
| Φ203 × 35 | 7.99″ |
| Φ203 × 37 | 7.99″ |
| Φ203 × 40 | 7.99″ |
| Φ203 × 45 | 7.99″ |
| Φ203 × 55 | 7.99″ |
| Φ203 × 57 | 7.99″ |
| Φ219 × 22 | 8.62″ |
| Φ219 × 25 | 8.62″ |
| Φ219 × 30 | 8.62″ |
| Φ219 × 31 | 8.62″ |
| Φ219 × 32 | 8.62″ |
| Φ219 × 35 | 8.62″ |
| Φ219 × 38 | 8.62″ |
| Φ219 × 40 | 8.62″ |
| Φ219 × 45 | 8.62″ |
| Φ219 × 60 | 8.62″ |
| Φ223 × 45 | 8.78″ |
| Φ224 × 47 | 8.82″ |
| Φ232 × 30 | 9.13″ |
| Φ232 × 32 | 9.13″ |
| Φ232 × 35 | 9.13″ |
| Φ232 × 38 | 9.13″ |
| Φ232 × 40 | 9.13″ |
| Φ232 × 45 | 9.13″ |
| Φ232 × 50 | 9.13″ |
| Φ232 × 55 | 9.13″ |
| Φ232 × 60 | 9.13″ |
| Φ232 × 65 | 9.13″ |
| Φ234.5 × 25.4 | 9.23″ |
| Φ245 × 21 | 9.65″ |
| Φ245 × 22 | 9.65″ |
| Φ245 × 23 | 9.65″ |
| Φ245 × 25 | 9.65″ |
| Φ245 × 37 | 9.65″ |
| Φ245 × 40 | 9.65″ |
| Φ245 × 45 | 9.65″ |
| Φ245 × 50 | 9.65″ |
| Φ245 × 55 | 9.65″ |
| Φ245 × 60 | 9.65″ |
| Φ254 × 23 | 10.00″ |
| Φ254 × 25 | 10.00″ |
| Φ254 × 28 | 10.00″ |
| Φ254 × 32 | 10.00″ |
| Φ254 × 35 | 10.00″ |
| Φ254 × 38 | 10.00″ |
| Φ254 × 40 | 10.00″ |
| Φ254 × 42 | 10.00″ |
| Φ254 × 60 | 10.00″ |
| Φ254 × 75 | 10.00″ |
| Φ258 × 40 | 10.16″ |
| Φ258 × 55 | 10.16″ |
| Φ258 × 60 | 10.16″ |
| Φ265 × 35 | 10.43″ |
| Φ266 × 28 | 10.47″ |
| Φ267 × 38 | 10.51″ |
| Φ269 × 39 | 10.59″ |
| Φ269 × 40 | 10.59″ |
| Φ270 × 55 | 10.63″ |
| Φ273 × 20 | 10.75″ |
| Φ273 × 22 | 10.75″ |
| Φ273 × 25 | 10.75″ |
| Φ273 × 27 | 10.75″ |
| Φ273 × 28 | 10.75″ |
| Φ273 × 30 | 10.75″ |
| Φ273 × 32 | 10.75″ |
| Φ273 × 35 | 10.75″ |
| Φ273 × 38 | 10.75″ |
| Φ273 × 40 | 10.75″ |
| Φ273 × 42 | 10.75″ |
| Φ273 × 50 | 10.75″ |
| Φ273 × 55 | 10.75″ |
| Φ273 × 60 | 10.75″ |
| Φ273 × 65 | 10.75″ |
| Φ273 × 75 | 10.75″ |
| Φ285 × 16 | 11.22″ |
| Φ285 × 23 | 11.22″ |
| Φ285 × 25 | 11.22″ |
| Φ285 × 30 | 11.22″ |
| Φ285 × 31 | 11.22″ |
| Φ285 × 50 | 11.22″ |
| Φ285 × 53 | 11.22″ |
| Φ285 × 55 | 11.22″ |
| Φ285 × 60 | 11.22″ |
| Φ285 × 65 | 11.22″ |
| Φ285 × 70 | 11.22″ |
| Φ299 × 20 | 11.77″ |
| Φ299 × 22 | 11.77″ |
| Φ299 × 27 | 11.77″ |
| Φ299 × 28 | 11.77″ |
| Φ299 × 30 | 11.77″ |
| Φ299 × 32 | 11.77″ |
| Φ299 × 35 | 11.77″ |
| Φ299 × 37 | 11.77″ |
| Φ299 × 40 | 11.77″ |
| Φ299 × 45 | 11.77″ |
| Φ299 × 50 | 11.77″ |
| Φ299 × 55 | 11.77″ |
| Φ299 × 60 | 11.77″ |
| Φ299 × 65 | 11.77″ |
| Φ299 × 70 | 11.77″ |
| Φ299 × 75 | 11.77″ |
| Φ306 × 45 | 12.05″ |
| Φ306 × 55 | 12.05″ |
| Φ325 × 20 | 12.80″ |
| Φ325 × 22 | 12.80″ |
| Φ325 × 24 | 12.80″ |
| Φ325 × 28 | 12.80″ |
| Φ325 × 30 | 12.80″ |
| Φ325 × 32 | 12.80″ |
| Φ325 × 35 | 12.80″ |
| Φ325 × 40 | 12.80″ |
| Φ325 × 50 | 12.80″ |
| Φ325 × 55 | 12.80″ |
| Φ325 × 60 | 12.80″ |
| Φ325 × 62 | 12.80″ |
| Φ325 × 65 | 12.80″ |
| Φ325 × 90 | 12.80″ |
| Φ330 × 30 | 12.99″ |
| Φ330 × 44 | 12.99″ |
| Φ330 × 52 | 12.99″ |
| Φ330 × 53 | 12.99″ |
| Φ330 × 75 | 12.99″ |
| Φ330 × 85 | 12.99″ |
| Φ335 × 45 | 13.19″ |
| Φ340 × 27 | 13.39″ |
| Φ340 × 35 | 13.39″ |
| Φ340 × 62 | 13.39″ |
| Φ345 × 60 | 13.58″ |
| Φ351 × 32 | 13.82″ |
| Φ351 × 35 | 13.82″ |
| Φ351 × 45 | 13.82″ |
| Φ351 × 65 | 13.82″ |
| Φ351 × 85 | 13.82″ |
| Φ356 × 24 | 14.02″ |
| Φ356 × 25 | 14.02″ |
| Φ356 × 26 | 14.02″ |
| Φ356 × 28 | 14.02″ |
| Φ356 × 30 | 14.02″ |
| Φ356 × 32 | 14.02″ |
| Φ356 × 35 | 14.02″ |
| Φ356 × 38 | 14.02″ |
| Φ356 × 40 | 14.02″ |
| Φ356 × 42 | 14.02″ |
| Φ356 × 45 | 14.02″ |
| Φ356 × 50 | 14.02″ |
| Φ356 × 55 | 14.02″ |
| Φ356 × 65 | 14.02″ |
| Φ356 × 70 | 14.02″ |
| Φ356 × 95 | 14.02″ |
| Φ360 × 20 | 14.17″ |
| Φ365 × 37 | 14.37″ |
| Φ368 × 30 | 14.49″ |
| Φ368 × 60 | 14.49″ |
| Φ377 × 20 | 14.84″ |
| Φ377 × 21 | 14.84″ |
| Φ377 × 25 | 14.84″ |
| Φ377 × 28 | 14.84″ |
| Φ377 × 30 | 14.84″ |
| Φ377 × 32 | 14.84″ |
| Φ377 × 35 | 14.84″ |
| Φ377 × 38 | 14.84″ |
| Φ377 × 40 | 14.84″ |
| Φ377 × 42 | 14.84″ |
| Φ377 × 45 | 14.84″ |
| Φ377 × 55 | 14.84″ |
| Φ377 × 65 | 14.84″ |
| Φ377 × 75 | 14.84″ |
| Φ377 × 80 | 14.84″ |
| Φ377 × 85 | 14.84″ |
| Φ377 × 90 | 14.84″ |
| Φ377 × 100 | 14.84″ |
| Φ380 × 48 | 14.96″ |
| Φ385 × 40 | 15.16″ |
| Φ390 × 25 | 15.35″ |
| Φ390 × 30 | 15.35″ |
| Φ390 × 35 | 15.35″ |
| Φ390 × 40 | 15.35″ |
| Φ390 × 45 | 15.35″ |
| Φ390 × 85 | 15.35″ |
| Φ400 × 60 | 15.75″ |
| Φ402 × 16 | 15.83″ |
| Φ402 × 23 | 15.83″ |
| Φ402 × 25 | 15.83″ |
| Φ402 × 30 | 15.83″ |
| Φ402 × 35 | 15.83″ |
| Φ402 × 38 | 15.83″ |
| Φ402 × 40 | 15.83″ |
| Φ402 × 45 | 15.83″ |
| Φ402 × 55 | 15.83″ |
| Φ402 × 70 | 15.83″ |
| Φ402 × 80 | 15.83″ |
| Φ405 × 35 | 15.94″ |
| Φ405 × 37 | 15.94″ |
| Φ405 × 45 | 15.94″ |
| Φ405 × 120 | 15.94″ |
| Φ406 × 20 | 15.98″ |
| Φ406 × 25 | 15.98″ |
| Φ406 × 28 | 15.98″ |
| Φ406 × 30 | 15.98″ |
| Φ406 × 32 | 15.98″ |
| Φ406 × 35 | 15.98″ |
| Φ406 × 38 | 15.98″ |
| Φ406 × 40 | 15.98″ |
| Φ406 × 45 | 15.98″ |
| Φ406 × 47 | 15.98″ |
| Φ406 × 50 | 15.98″ |
| Φ406 × 55 | 15.98″ |
| Φ406 × 57 | 15.98″ |
| Φ406 × 60 | 15.98″ |
| Φ406 × 65 | 15.98″ |
| Φ406 × 70 | 15.98″ |
| Φ406 × 75 | 15.98″ |
| Φ406 × 80 | 15.98″ |
| Φ415 × 28 | 16.34″ |
| Φ415 × 50 | 16.34″ |
| Φ420 × 35 | 16.54″ |
| Φ421 × 44 | 16.57″ |
| Φ426 × 25 | 16.77″ |
| Φ426 × 30 | 16.77″ |
| Φ426 × 35 | 16.77″ |
| Φ426 × 42 | 16.77″ |
| Φ426 × 50 | 16.77″ |
| Φ426 × 52 | 16.77″ |
| Φ426 × 55 | 16.77″ |
| Φ426 × 70 | 16.77″ |
| Φ426 × 75 | 16.77″ |
| Φ426 × 80 | 16.77″ |
| Φ426 × 85 | 16.77″ |
| Φ426 × 90 | 16.77″ |
| Φ426 × 95 | 16.77″ |
| Φ426 × 100 | 16.77″ |
| Φ426 × 110 | 16.77″ |
| Φ426 × 120 | 16.77″ |
| Φ430 × 75 | 16.93″ |
| Φ432 × 40 | 17.01″ |
| Φ436 × 96 | 17.17″ |
| Φ438 × 65 | 17.24″ |
| Φ440 × 25 | 17.32″ |
| Φ440 × 28 | 17.32″ |
| Φ440 × 30 | 17.32″ |
| Φ440 × 40 | 17.32″ |
| Φ440 × 45 | 17.32″ |
| Φ440 × 50 | 17.32″ |
| Φ440 × 75 | 17.32″ |
| Φ440 × 80 | 17.32″ |
| Φ440 × 100 | 17.32″ |
| Φ450 × 40 | 17.72″ |
| Φ450 × 45 | 17.72″ |
| Φ450 × 50 | 17.72″ |
| Φ450 × 75 | 17.72″ |
| Φ450 × 90 | 17.72″ |
| Φ450 × 95 | 17.72″ |
| Φ457 × 20 | 17.99″ |
| Φ457 × 21 | 17.99″ |
| Φ457 × 25 | 17.99″ |
| Φ457 × 26 | 17.99″ |
| Φ457 × 30 | 17.99″ |
| Φ457 × 35 | 17.99″ |
| Φ457 × 37 | 17.99″ |
| Φ457 × 38 | 17.99″ |
| Φ457 × 40 | 17.99″ |
| Φ457 × 45 | 17.99″ |
| Φ457 × 50 | 17.99″ |
| Φ457 × 55 | 17.99″ |
| Φ457 × 60 | 17.99″ |
| Φ457 × 65 | 17.99″ |
| Φ457 × 70 | 17.99″ |
| Φ457 × 75 | 17.99″ |
| Φ457 × 80 | 17.99″ |
| Φ457 × 85 | 17.99″ |
| Φ457 × 100 | 17.99″ |
| Φ460 × 60 | 18.11″ |
| Φ465 × 70 | 18.31″ |
| Φ470 × 35 | 18.50″ |
| Φ470 × 60 | 18.50″ |
| Φ470 × 75 | 18.50″ |
| Φ470 × 80 | 18.50″ |
| Φ471 × 30 | 18.54″ |
| Φ473 × 40 | 18.62″ |
| Φ475 × 45 | 18.70″ |
| Φ475 × 55 | 18.70″ |
| Φ480 × 25 | 18.90″ |
| Φ480 × 27 | 18.90″ |
| Φ480 × 30 | 18.90″ |
| Φ480 × 35 | 18.90″ |
| Φ480 × 45 | 18.90″ |
| Φ480 × 50 | 18.90″ |
| Φ480 × 55 | 18.90″ |
| Φ480 × 60 | 18.90″ |
| Φ490 × 40 | 19.29″ |
| Φ490 × 45 | 19.29″ |
| Φ490 × 50 | 19.29″ |
| Φ490 × 55 | 19.29″ |
| Φ490 × 60 | 19.29″ |
| Φ490 × 65 | 19.29″ |
| Φ490 × 70 | 19.29″ |
| Φ500 × 50 | 19.69″ |
| Φ500 × 55 | 19.69″ |
| Φ508 × 30 | 20.00″ |
| Φ508 × 32 | 20.00″ |
| Φ508 × 34 | 20.00″ |
| Φ508 × 35 | 20.00″ |
| Φ508 × 38 | 20.00″ |
| Φ508 × 45 | 20.00″ |
| Φ508 × 50 | 20.00″ |
| Φ508 × 55 | 20.00″ |
| Φ508 × 60 | 20.00″ |
| Φ508 × 65 | 20.00″ |
| Φ508 × 68 | 20.00″ |
| Φ520 × 36 | 20.47″ |
| Φ530 × 27 | 20.87″ |
| Φ530 × 28 | 20.87″ |
| Φ530 × 29 | 20.87″ |
| Φ530 × 40 | 20.87″ |
| Φ530 × 45 | 20.87″ |
| Φ530 × 50 | 20.87″ |
| Φ530 × 55 | 20.87″ |
| Φ530 × 85 | 20.87″ |
| Φ530 × 90 | 20.87″ |
| Φ530 × 95 | 20.87″ |
| Φ530 × 100 | 20.87″ |
| Φ530 × 105 | 20.87″ |
| Φ530 × 110 | 20.87″ |
| Φ530 × 120 | 20.87″ |
| Φ540 × 75 | 21.26″ |
| Φ540 × 85 | 21.26″ |
| Φ550 × 45 | 21.65″ |
| Φ550 × 60 | 21.65″ |
| Φ550 × 80 | 21.65″ |
| Φ550 × 85 | 21.65″ |
| Φ550 × 90 | 21.65″ |
| Φ550 × 95 | 21.65″ |
| Φ550 × 100 | 21.65″ |
| Φ550 × 105 | 21.65″ |
| Φ550 × 110 | 21.65″ |
| Φ550 × 115 | 21.65″ |
| Φ550 × 120 | 21.65″ |
| Φ560 × 30 | 22.05″ |
| Φ560 × 31 | 22.05″ |
| Φ560 × 45 | 22.05″ |
| Φ560 × 48 | 22.05″ |
| Φ560 × 60 | 22.05″ |
| Φ560 × 65 | 22.05″ |
| Φ560 × 120 | 22.05″ |
| Φ560 × 130 | 22.05″ |
| Φ560 × 140 | 22.05″ |
| Φ570 × 60 | 22.44″ |
| Φ570 × 70 | 22.44″ |
| Φ570 × 75 | 22.44″ |
| Φ570 × 80 | 22.44″ |
| Φ570 × 120 | 22.44″ |
| Φ580 × 43 | 22.83″ |
| Φ580 × 50 | 22.83″ |
| Φ580 × 55 | 22.83″ |
| Φ580 × 65 | 22.83″ |
| Φ580 × 75 | 22.83″ |
| Φ580 × 80 | 22.83″ |
| Φ580 × 90 | 22.83″ |
| Φ580 × 130 | 22.83″ |
| Φ585 × 50 | 23.03″ |
| Φ585 × 60 | 23.03″ |
| Φ590 × 60 | 23.23″ |
| Φ590 × 75 | 23.23″ |
| Φ600 × 40 | 23.62″ |
| Φ600 × 45 | 23.62″ |
| Φ600 × 50 | 23.62″ |
| Φ600 × 55 | 23.62″ |
| Φ600 × 60 | 23.62″ |
| Φ600 × 65 | 23.62″ |
| Φ600 × 70 | 23.62″ |
| Φ600 × 75 | 23.62″ |
| Φ600 × 80 | 23.62″ |
| Φ600 × 90 | 23.62″ |
| Φ610 × 38 | 24.02″ |
| Φ610 × 40 | 24.02″ |
| Φ610 × 43 | 24.02″ |
| Φ610 × 48 | 24.02″ |
| Φ610 × 55 | 24.02″ |
| Φ610 × 60 | 24.02″ |
| Φ614 × 50 | 24.17″ |
| Φ614 × 53 | 24.17″ |
| Φ620 × 48 | 24.41″ |
| Φ620 × 50 | 24.41″ |
| Φ620 × 70 | 24.41″ |
| Φ620 × 90 | 24.41″ |
| Φ630 × 40 | 24.80″ |
| Φ630 × 42 | 24.80″ |
| Φ630 × 45 | 24.80″ |
| Φ630 × 50 | 24.80″ |
| Φ630 × 55 | 24.80″ |
| Φ630 × 60 | 24.80″ |
| Φ630 × 65 | 24.80″ |
| Φ635 × 45 | 25.00″ |
45# — common questions
- What is 45# equivalent to?
- 45# is closest to AISI 1045, EN C45 / 1.0503, JIS S45C. These are the standard comparisons used for sourcing; the mill certificate supplied with each shipment carries the actual chemistry and mechanical values for the heat.
- What sizes of 45# do you stock?
- We currently hold 438 size combinations of 45#, from Φ95mm to Φ635mm outside diameter with wall thickness from 15mm to 140mm.
- Can you supply 45# heat treated?
- Yes. We supply 45# in these delivery conditions: Hot rolled, Normalized, Quenched & tempered, Annealed. Heat treatment is done in-house before shipment and process records with temperature curves ship with the goods.
- Can 45# be cut to length before shipment?
- Yes. We saw-cut to fixed lengths with a typical tolerance of ±1–2mm and end squareness of ≤1mm/100mm, so the material can go straight onto your machine without a facing operation.
Need 45# in a size that isn't listed?
Non-standard sizes are our specialty — and for repeat requirements we hold dedicated stock. Send your size list and we'll confirm within 24 hours.