SS 2127 Alloy Steel Bar 2127 Round Bars 2127 Rods

Product Description

SS 2127 (often listed in historical inventories as SS 142127) is a vintage Swedish standard (Mekanfrbundet / SIS) low-alloy, low-carbon manganese-chromium engineering steel specifically optimized for case hardening (carburizing).

In the European standard framework, SS 2127 corresponds directly to 16MnCr5 (Werkstoffnummer 1.7131) or its sulfur-controlled resulfurized version 16MnCrS5 (1.7139). It is a highly dependable material for round bars, rods, and shafts that require an exceptionally hard, wear-resistant surface profile alongside a highly ductile, shock-absorbing core.

Technical Specifications & Chemical Composition

The balanced addition of Manganese (Mn) and Chromium (Cr) provides this grade with uniform core hardenability in small-to-medium cross-sections, while its low carbon base guarantees a reliable, predictable response during gas or vacuum carburization.

Chemical Composition (Weight % per SS 142127 / 16MnCr5)

*Note: Variants supplied specifically under the 16MnCrS5 equivalent track sulfur levels strictly between 0.020% and 0.040% to intentionally elevate chips-breaking behavior during high-speed CNC machining lines.

Mechanical Properties (Typical Core Values Post-Heat Treatment)

Before surface enrichment, the core properties of SS 2127 bars prevent the cracking or cave-in of brittle surface cases when exposed to heavy localized pounding or point-loads.

Mechanical Benchmarks (Tested on $\le$ 16 mm Treated Sections)

Global Cross-Reference Equivalents

Because the older Swedish standard "SS" identifiers have largely been harmonized under global sourcing networks, you can reliably cross-specify SS 2127 against these modern equivalent materials:

• Europe (EN / DIN): 16MnCr5 (1.7131) or 16MnCrS5 (1.7139)

• USA (AISI/SAE): AISI 5115 / SAE 5117

• China (GB/T): 15CrMn / 20CrMnTi

• United Kingdom (BS): 527M20 / 590M17

• Japan (JIS): SMnC420 / SNC415

Thermal Processing & Carburizing Parameters

• Forging / Hot Rolling: 1150 850C

• Normalizing: 870 900C (Air cooled)

• Soft Annealing (+A): 650 - 700C (Slow furnace cool to maximize tool life)

• Carburizing Cycle: 880-980C (Atmosphere enriched with carbon gas)

• Core Refining Hardening: 860C -900C (Oil or polymer quench)

• Case Refining Hardening: 780C -820C (Oil quench to capture surface martensite)

• Low-Stress Tempering: 150-200C (Minimum 1 hour to stabilize the matrix without shedding HRC)

Primary Structural Applications of SS 2127 Bars

SS 2127 round bars excel in mass-production environments where components face constant surface sliding wear, structural fatigue, or high tooth-contact pressures:

• Power Transmission Components: Small-to-medium spur gears, helical gears, spline shafts, and pinions.

• Automotive Control Links: Piston gudgeon pins, universal joint journals, steering worms, and clutch hubs.

• Tooling & Mechanical Engineering: Guide bushings, cam lobes, friction rollers, and sub-assembly indexing shafts.

• Pneumatic / Hydraulic Tools: Wear blocks, internal valve pistons, and impact rods.

Weldability Advisory: As with all dedicated carburizing/case-hardening grades, welding structural joints using SS 2127 is broadly discouraged. Carburized zones will form localized brittle cracking zones near the heat-affected boundaries. If welding is absolute, it must be performed on the raw base metal prior to any case-hardening operations, accompanied by strict pre-heating protocols.