China 15CDV6 High-Strength Low-Alloy Seamless Steel Tube for Crankshaft with 30 - 325 mm Outer Diameter for sale

15CDV6 High-Strength Low-Alloy Seamless Steel Tube for Crankshaft with 30 - 325 mm Outer Diameter

Name: 15CDV6 High-Strength Low-Alloy Seamless Steel Tube for Crankshaft with 30 - 325 mm Outer Diameter
Brand: TORICH INTERNATIONAL LIMITED

Price Negotiable

Price: 800-1000 USD/Ton

MOQ: 1Ton

Delivery Time: 20-30days upon products

Brand: TORICH

Product Description

1.7734 (15CDV6) Tube — High-Strength Low-Alloy Seamless Steel Tube for Crankshafts

Material

1.7734 (15CDV6) is a low-carbon Cr-Mo-V high-strength low-alloy steel widely selected when crankshaft and rotating parts need a strong strength-to-weight balance, high fatigue capability, and reliable toughness. It is commonly referenced in aerospace and motorsport supply chains and is well known for being weldable compared with many other high-strength alloy steels.

Specifications

Product form: Seamless round steel tube (hot-finished and/or cold-drawn; heat treatment per requirement).
Typical supply length: 1–7 meters; custom cut available.
Straightness (typical): 0.3–2 mm/m (by supply class).
Delivery condition (common): Annealed / normalized / quenched & tempered (Q&T) to target strength level.
Inspection (typical options): Dimensional check, chemical analysis, tensile/impact testing, and NDT such as UT/ET upon request (based on project requirement).

Key Features

High yield & tensile strength with toughness (strength level adjustable via heat treatment).
Good weldability profile for a high-strength steel (especially compared with many Cr-Mo grades that require stricter welding controls).
Cr-Mo-V alloying supports fatigue-critical parts such as shafts and crankshafts, with stable properties after Q&T.

Our Advantages

1) “Can it be welded safely without losing properties or cracking?”

15CDV6 is widely described as readily weldable with minimal property loss and typically without mandatory post-weld heat treatment in many practical applications.
For comparison, common Cr-Mo steels like 4140 often require strict preheat/controlled procedures and are frequently discouraged for welding in the hardened & tempered condition. We provide fabrication guidance and can supply in a fabrication-friendly condition if welding is part of your process route.

2) “What strength level should I specify for crankshaft fatigue life?”

We support Q&T strength targets by diameter/thickness and can align supply to your machining + final heat-treat plan (rough-machining first, then finish Q&T, or supply Q&T directly). Typical published strength windows are shown in the mechanical table below.

3) “Do you control toughness/impact performance?”

Where required, we can quote impact requirements and test plans (Charpy/Izod) consistent with the referenced standard/condition. Comparable grades commonly publish minimum impact values by section.

4) “Will machinability and dimensional stability be OK for crankshaft machining?”

We can supply the tube in an annealed/normalized state for efficient rough machining, then Q&T to final strength; or supply in pre-hardened/Q&T condition when your process needs immediate high strength.

5) “How do I confirm equivalence across standards and avoid a wrong substitute?”

We provide cross-standard reference support (EN/ASTM/JIS/GB/GOST) and can propose the closest practical alternative if a project mandates a different national standard.

Chemical Composition

Grade	Standard system (typical reference)	C	Si	Mn	Cr	Mo	V	P	S
15CDV6 (1.7734)	AIR 9160C (commonly referenced)	0.12–0.18	≤0.20	0.80–1.10	1.25–1.50	0.80–1.00	0.20–0.30	≤0.020	≤0.015
42CrMo4 (1.7225)	DIN EN ISO 683-2 / EN family	0.38–0.45	0.10–0.40	0.60–0.90	0.90–1.20	0.15–0.30	—	≤0.025	≤0.035
AISI 4140	ASTM A29 (commonly referenced)	0.36–0.44	0.10–0.40	0.65–1.10	0.75–1.20	0.15–0.35	—	≤0.04	≤0.04
SCM435	JIS G4053	0.33–0.38	0.15–0.35	0.60–0.90	0.90–1.20	0.15–0.30	—	≤0.03	≤0.03
30KhGSA (30ХГСА)	GOST 4543 (commonly referenced)	0.28–0.34	0.90–1.20	0.80–1.10	0.80–1.10	—	—	≤0.025	≤0.025

Data compiled from published grade references/datasheets.

Mechanical Properties

Note: Mechanical properties vary with section size and heat treatment. Values below reflect commonly published Q&T / treated conditions.

Grade	Condition basis (example)	Yield / Proof (MPa)	Tensile (MPa)	Elongation (%)	Impact (example)
15CDV6 (1.7734)	Treated Ø16–40 mm (example)	≥930	1080–1280	≥10	—
42CrMo4 (1.7225)	Q&T, round 16–40 mm	≥750	1000–1200	≥11	≥35 J (Charpy-V)
AISI 4140	Heat-treated condition “T” (example table)	≥665 (0.2% proof)	850–1000	≥13	≥50 J (Charpy)
SCM435	Reported minimum values (example)	≥835	≥985	≥12	≥63 J (Akv)
30KhGSA (30ХГСА)	Q&T example (Ø25 bar listing)	830	1080	10	490 kJ/m² (KCU)

Data compiled from published grade references/datasheets.

Standards & Compliance

ASTM (typical references for similar alloy tubes/chemistry):
ASTM A519 (seamless mechanical tubing); ASTM A29/A29M (chemistry reference for 41xx families, e.g., 4140).
EN (common routes for mechanical tubes & Q&T alloy steels):
EN/ISO 683-2 (Q&T alloy steels; includes 42CrMo4); project-specific tube supply often aligns with EN seamless tube standards depending on end use.
GOST:
GOST 4543 (alloy structural steels); GOST 8731 / GOST 8733 (seamless tube references shown in grade listings).
JIS:
JIS G4053 (SCM series alloy steels for machine structural use).
GB (China):
Common equivalents for the Cr-Mo family include GB/T 3077 (42CrMo) (often cross-referenced with 42CrMo4 / 4140).

Application Fields

Broad industries: automotive & motorsport driveline parts, aerospace structures, heavy machinery, energy equipment.

Where it’s used inside the crankshaft value chain:

Crankshaft body/blank machining: high-strength tube/stock for weight reduction concepts or specialized designs.
Related rotating components: connecting rods, shafts, axles, gear/drive elements—especially where fatigue resistance and Q&T strength stability are critical.