AISI 6150 Springs
6150 Equivalents - ASTM A29, EN 10083, JIS G4801, GB/T 3077
Durable, dependable AISI 6150 springs power industrial applications thanks to their hardness and shock-resistant properties. This chromium-vanadium spring steel is a competitive option for both tempering and oil-hardening processes. Thanks to Coiling Technologies, you can easily order custom springs using AISI 6150 steel or your chosen alloy.
Characteristics of AISI 6150 Springs
Springs manufactured with AISI 6150 are made of fine-grained, highly abrasion-resistant carbon-chromium alloy steel. This steel provides outstanding shock resistance and toughness when heat treated. When tempered, the alloy is a popular option for environments with harsh shocks and vibrations. The following technical specifications highlight the characteristics of this alloy that make it a competitive choice in many industries.
| Technical Specification | AISI 6150 |
|---|---|
| Nominal Composition |
C: 0.48 - 0.53 Mn:.0.70 – 0.90 Cr: 0.8 - 1.1 |
| Density |
0.283 lb./in3 |
| Modulus of Elasticity (E) |
29.7x 103 ksi |
| Modulus of Rigidity (G) |
11.6 x 103 ksi |
| Electrical Resistivity |
234 µΩ.cm |
| Thermal Conductivity |
323 Btu/(hr/ft2/in/°F) |
| Min Size |
0.005 in (0.130 mm) |
| Uses |
This alloy is used in automobile engineering for the production of medium and large cross section forged components, which require high tensile strength and toughness. |
Applications of AISI 6150
If your industry uses springs that must withstand high-load shock, stress, and vibration situations, then AISI 6150 may be the right spring steel for you. Here are some common industries we supply with custom components using AISI 6150 and other specialty alloys:
Aftermarket automotive leaf springs, construction equipment compression springs, and rock crusher springs are just a few examples of springs we manufacture at Coiling Technologies. Our low rejection rate ensures quality components that can withstand the harsh corrosion and vibration of your industrial setting.
Connect With Coiling Technologies for AISI 6150 Springs
Reach out to see how AISI 6150 springs compare with custom components manufactured using other specialty alloys. Request a quote today or give us a call at 1 (800) 969-2645 to find answers about alloys or learn more about our custom manufacturing process. We’re confident we can work with you to find the right alloy and design to power your process with a dependable spring design and an alloy you can rely on.
AISI 6150 Springs FAQs
What is AISI 6150 spring steel?
AISI 6150 is a chromium vanadium spring steel. The published composition is 0.48 to 0.53 percent carbon, 0.70 to 0.90 percent manganese, and 0.8 to 1.1 percent chromium, with vanadium the characteristic addition that gives the grade its name. Vanadium forms fine carbides that refine grain size, producing the fine grained, highly abrasion resistant structure and the shock resistance the alloy is known for once heat treated. Density is listed at 0.283 lb/in3, modulus of elasticity at 29.7x10^3 ksi, and modulus of rigidity at 11.6x10^3 ksi.
What is AISI 6150 used for?
The published use covers automobile engineering and the production of medium and large cross section forged components requiring high tensile strength and toughness. Industries listed are oil and gas, automotive, playground and recreation equipment, military, and construction. Named examples include aftermarket automotive leaf springs, construction equipment compression springs, and rock crusher springs. CTI's hot rolled alloy documentation also points 6150 at automotive valve springs and leaf springs and notes that it heat treats easily with low distortion, which is why it holds up in high load shock, stress, and vibration service.
Which standards is AISI 6150 cross referenced to?
Published equivalents for the grade are ASTM A29, EN 10083, JIS G4801, and GB/T 3077, and the same chemistry appears as SAE 6150 in chrome vanadium documentation. Those are material specifications a customer can call out on a drawing, and CTI can build and heat treat springs to meet them. Chrome vanadium wire and bar is commonly purchased against ASTM A231 or ASTM A232 depending on whether valve spring quality is required. Name the exact specification at RFQ, since valve spring quality carries tighter surface and inclusion requirements than general purpose bar.
What service temperature can a 6150 spring handle?
The specification table for this grade does not include a maximum temperature row, so treat the limit as something to confirm for your specific part. CTI publishes 425 degrees F (220 degrees C) for chrome vanadium, the closely related grade, and 450 degrees F (230 degrees C) as the general ceiling for its low alloy carbon steels. Both sit far above the 200 degrees F published for plain carbon 1050, and that gap is the usual reason a buyer steps up to 6150. Beyond the low alloy range, relaxation under sustained load becomes the governing failure mode.
What is the minimum size available in 6150?
The specification table lists a minimum size of 0.005 in (0.130 mm). Practical use of 6150 concentrates in heavier sections, since the grade is supplied hot rolled without a mill temper and earns its cost in parts thick enough to need real hardenability. CTI's published carbon and low alloy range runs from 0.008 in wire to 2.5 in bar. Confirm your diameter during quoting, because both material availability and the heat treat plan shift with section size, and small diameter chrome vanadium is more often bought as pre-tempered ASTM A231 wire.
How does 6150 compare with 5160?
Both are hot rolled alloy spring steels for medium and large cross sections, and both require quench and temper after forming. 5160 sits higher in carbon, published at 0.56 to 0.61 percent against 0.48 to 0.53 percent for 6150, and carries chromium as its main alloy addition. 6150 adds vanadium, which refines grain, improves shock and vibration resistance, and reduces distortion during heat treatment. Choose 5160 for classic heavy leaf and coil suspension work. Choose 6150 where impact loading, vibration, or dimensional stability through the furnace drives the requirement.
How is a 6150 spring protected against corrosion?
Chrome vanadium carries roughly one percent chromium, nowhere near enough to passivate, so 6150 springs corrode like any low alloy steel and need a coating in wet or outdoor service. Powder coating, performed in house at CTI, is common on large springs. Phosphate and oil or another metallic conversion coating are alternatives. Electroplating a hardened chrome vanadium spring risks hydrogen embrittlement and requires prompt baking after plating. When the environment rather than the load is the limiting factor, a stainless or nickel alloy spring will outlast any coated 6150 part.
What does in-house heat treating change for a 6150 order?
Every published property of 6150 depends on the quench and temper cycle, so control of that step is control of the part. Coiling Technologies runs engineering services, spring design, coiling, heat treating, non-destructive testing, shot peen, powder coating, and prototyping in one Houston facility under one ISO 9001:2015 certified quality management system, with no outside vendor handling the spring between operations. That removes transit damage, mixed lots, and the traceability gaps that appear when forming and thermal processing sit at different companies. Traceability runs from the finished spring back to incoming raw material.
