Shock-resisting steel explained

Shock-resisting steels are a class of tool steels designed to resist breakage by shock. Under the AISI classification system there are seven types, labeled S1 to S7.

Overview

Shock-resisting steels are designed to have high impact resistance (toughness), along with other properties such as strength, hardness. Silicon is a common addition to this class of steels, as it provides tempering resistance and increases toughness.

Applications for shock-resisting steels includes springs, as well as chisels, dies for forging, and punches. S2 steel is also used to make ball bearings for the mining industry.[1] They are also used for screwdrivers and driver bits.

TypeC %Si %V %Cr %Mn %Ni %Mo %W %
S1 (UNS T41901)0.40–0.550.15–1.200.15–0.301.00–1.800.10–0.40<0.30<0.501.50–3.00
S2 (UNS T41902)0.40–0.550.90–1.20<0.500.30–0.50<0.300.30–0.60
S3[2] 0.502.000.741.00
S4 (UNS T41904)? ~0.4–0.651.75–2.250.350.350.60–0.90
S5 (UNS T41905)0.50–0.651.75–2.25<0.35<0.500.60–1.000.20–1.35
S6 (UNS T41906)0.40–0.50 2.00–2.500.20–0.401.20–1.501.20–1.500.30–0.50
S7 (UNS T41907)0.45–0.550.20–1.000.20–0.303.00–3.500.20–0.901.30–1.80

SVCM

SVCM steel is a kind of shock-resisting steel.[3] SVCM steel is an alloy of carbon, silicon, chromium, magnesium, nickel, molybdenum and lead. SVCM+ in addition is quenched and tempered achieving a high hardness (HRC 59).[4] SCVM+ has better torsional properties than chromium-vanadium steel (Cr-V).[5]

Notes and References

  1. Book: 1977 . 69 . Metallurgical Society of AIME .
  2. Book: ASM Specialty Handbook: Tool Materials . Joseph R. . Davis . 123, Table 2 . ASM International . 1995 . 978-0-87170-545-7 .
  3. Web site: What Our Tools Are Made Out of . Olsa Tools. 12 March 2021 .
  4. Web site: Screwdrivers . Draper Tools . Made by blending carbon, silicon, magnesium, nickel, chromium, molybdenum and lead to create a metal featuring a host of qualities including high strength and ductility.
  5. Web site: Common materials for hand tools: Carbon steel & Chromium-vanadium steel . August 14, 2018 . Wait.