Materials Database - Revision history

Bnaing3: /* Sources */

2025-02-27T07:03:25Z

‎Sources

2023-04-12T19:50:55Z

‎AR500 Steel

2023-04-12T19:49:37Z

‎Abrasion-Resistant (AR) Steel

2023-04-12T19:48:46Z

‎AR500 Steel

2023-03-05T06:06:06Z

‎Abrasion-Resistant (AR) Steel

2023-03-05T06:04:29Z

‎AR500 Steel

2022-12-29T02:02:48Z

‎Steels

2022-12-29T02:01:48Z

‎Grade 5 Titanium (Ti-6Al-4V)

2022-12-29T02:00:54Z

‎Aluminum 7075-T6

2022-12-29T01:58:47Z

‎Tool Steel

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 *S7 Tool Steel:
 **Riobotz Combot Tutorial (Pg. 82): https://www.riobotz.com/riobotz-combot-tutorial
 **Team Caustic Creations: https://www.arrow.com/en/research-and-events/articles/battlebot-episode-2

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 *Will rust over time when wet or exposed to air
 *Important to select a supplier which gives you specifications and complies with specification codes. AR steels are not tightly regulated so the actual hardness and depth of hardening (completely through-hardened vs surface hardened) may vary by supplier.
-**Technically supposed to be through hardened but many sketchier suppliers will sell AR500 that is effectively only surface hardened with decreasing hardness with depth
+**Technically supposed to be through hardened but many sketchier suppliers will sell AR500 that is effectively only surface hardened (up to 1/8" depth from surface according to Seth from JustCuzRobotics/BloodSport) with decreasing hardness with depth and a soft core. This doesn't matter much for thinner parts 1/4" or thinner but matters alot for thicker parts.
 ====AR400 Steel====

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 *Will rust over time when wet or exposed to air
 *Important to select a supplier which gives you specifications and complies with specification codes. AR steels are not tightly regulated so the actual hardness and depth of hardening (completely through-hardened vs surface hardened) may vary by supplier.
 ====AR400 Steel====

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 *Anecdotal experience from builders says that AR500 typically bends before it fractures
 *Will rust over time when wet or exposed to air
 ====AR400 Steel====

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 |-
 | Charpy Impact (V-notch)
-| 18J
+| 24.4J
 |-
 | Familiar Sellers

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 *Extra important to avoid sharp internal corners and stress concentrations to prevent cracks from forming
-===AISI 4340 Steel ===
+===AISI Alloy Steels===
 ====AISI 4340 (43 HRC)====
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 *Relatively expensive
 ====AISI 4140 (-- HRC)====
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 *Typically sold and used  in its annealed state for high toughness. No heat treatment needed.
 *Typically used for armor, structural plates, sometimes weapons, it's pretty versatile material overall
-*known to fail in bending before failing in fracture
+*Known to fail in bending before failing in fracture
-*Very expensive
+*Very expensive, more so than most steels and aluminum alloys
 *Very difficult to machine or drill due to work hardening properties
 *In some cases, outsourcing to SendCutSend might be financial preferable to buying Ti stock so discuss with your PM

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 *Past and anecdotal experience notes that it tends to fracture before it bends as it's more brittle than 6061
 *Some builders recommend avoiding using it as armor or for parts that take direct hits due to fracture risk
-*Relatively easy to machine and is more expensive than 6061-T6
+*Relatively easy to machine
 === Aluminum 5052-H32 ===

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 ===Tool Steel===
-Unlike Abrasion Resistant or Carbon Steels, Tool Steels are specialized grades of steel used primarily for tool production (cutting bits, dies, etc.)
+Unlike abrasion-resistant or carbon steels, tool steels are specialized grades of steel used primarily for tool production and cutting bits.
 Added alloying elements such as Cr, V, Co, W, or Mo are added to greatly increase the strength and wear resistance of the steel, but tool steels tend to be more expensive than standard carbon steels.
 ====S7 Tool Steel (at 54 HRC)====