Grades · 40Cr
40Cr Alloy Steel Tube
Chromium alloy grade for parts that need better hardenability than 45# without the cost of a molybdenum addition. Machines cleanly in the annealed condition and hardens predictably.
9
Sizes in stock
Φ133–159
OD range (mm)
20–42
Wall range (mm)
GB/T 3077
Standard
International equivalents
| Chinese standard | GB/T 3077 |
|---|---|
| Closest equivalent | AISI 5140 |
| Also comparable | EN 41Cr4 / 1.7035 |
| Also comparable | JIS SCr440 |
Typical properties
| Tensile strength | ≥ 980 MPa (Q&T, standard minimum) |
|---|---|
| Yield strength | ≥ 785 MPa (Q&T, standard minimum) |
| Hardenability | Good for medium sections |
Typical applications
- Shafts, spindles and fasteners
- Gear and coupling blanks
- General machined components requiring Q&T
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 rolledAnnealedQuenched & tempered
40Cr sizes on the ground
9 combinations, updated 2026-08-22. Quantities turn over daily — confirm availability when you inquire.
| OD × Wall (mm) | OD (in) |
|---|---|
| Φ133 × 35 | 5.24″ |
| Φ140 × 30 | 5.51″ |
| Φ140 × 32 | 5.51″ |
| Φ146 × 20 | 5.75″ |
| Φ146 × 35 | 5.75″ |
| Φ146 × 42 | 5.75″ |
| Φ152 × 30 | 5.98″ |
| Φ159 × 28 | 6.26″ |
| Φ159 × 42 | 6.26″ |
40Cr — common questions
- What is 40Cr equivalent to?
- 40Cr is closest to AISI 5140, EN 41Cr4 / 1.7035, JIS SCr440. 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 40Cr do you stock?
- We currently hold 9 size combinations of 40Cr, from Φ133mm to Φ159mm outside diameter with wall thickness from 20mm to 42mm.
- Can you supply 40Cr heat treated?
- Yes. We supply 40Cr in these delivery conditions: Hot rolled, Annealed, Quenched & tempered. Heat treatment is done in-house before shipment and process records with temperature curves ship with the goods.
- Can 40Cr 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 40Cr 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.