Shock resisting steel

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.[1]

Applications for shock resisting steels includes springs, as well as chisels, dies for forging, and punches.[1] They are also used for screwdrivers and driver bits.[2]

Type C % Si % V % Cr % Mn % Ni % Mo % W %
S1 (UNS T41901)[1][2][lower-alpha 1] 0.40-0.55 0.15-1.20 0.15-0.30 1.00-1.80 0.10-0.40 <0.30 <0.50 1.50-3.00
S2 (UNS T41902)[1][2] 0.40-0.55 0.90-1.20 <0.50 - 0.30-0.50 <0.30 0.30-0.60 -
S3 [3] 0.50 2.00 - 0.74 - - - 1.00
S4 (UNS T41904)[1] ? ~0.4-0.65 1.75-2.25 0.35 0.35 0.60-0.90 -
S5 (UNS T41905)[1][2] 0.50-0.65 1.75-2.25 <0.35 <0.50 0.60-1.00 - 0.20-1.35 -
S6 (UNS T41906)[2] 0.40-0.50 2.00-2.50 0.20-0.40 1.20-1.50 1.20-1.50 - 0.30-0.50 -
S7 (UNS T41907)[1][2] 0.45-0.55 0.20-1.00 0.20-0.30[lower-alpha 2] 3.00-3.50 0.20-0.90 - 1.30-1.80 -
  1. Commonly known as 'tungsten chisel steel'
  2. May be omitted

SVCM

SVCM steel is an alloy of carbon, silicon, chromium, magnesium (Mg), nickel, molybdenum and lead (Pb).[4] 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]

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References
  1. Isakov, Edmund (2007), Cutting Data for Turning of Steel, Industrial Press Inc., Chapter 1 § 1.5.2 Shock-resisting tool steels. pp.82-84
  2. "Tool Steels - Shock-Resisting Tool Steels", www.azom.com
  3. Davis, Joseph R., ed. (1995), ASM Specialty Handbook: Tool Materials, p.123, Table 2.
  4. "Screwdrivers | Hand Tools | Draper Tools". www.drapertools.com.
  5. "Common materials for hand tools:Carbon steel & Chromium-vanadium steel". August 14, 2018.
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