Dimensions and Tolerances for Hot Rolled Track Shoe Sections, Part I: Section TS-L1

IS 10182 Part 1 — Scope: Key Dimensions, Symbols & Tolerances

1. Scope Summary

• Covers dimensions and tolerances for track shoe sections (grousers).
• Material recommendations are informative (Appendix A), not mandatory.

2. Key Dimensions & Tolerances (Table 1, Clause 4.1)

Unspecified dimensions have ±0.8 mm tolerance.

3. Important Symbols (Clause 2.1)

• Lt: Total length
• La: Grouser axis length
• twt: Thickness of grouser top
• tp: Plate thickness
• Hw: Grouser height
• R1-R10: Radii for toe, heel, fillets

Visual Concept: Grouser Dimensions

graph LR
  Lt[Total Length (Lt)]
  La[Grouser Axis Length (La)]
  twt[Thickness of Grouser Top (twt)]
  tp[Plate Thickness (tp)]
  Hw[Grouser Height (Hw)]
  R1[Toe Bottom Radius (R1)]
  R2[Toe Top Radius (R2)]
  R3[Heel Bottom Radius (R3)]
  R4[Heel Top Radius (R4)]

  Lt --> La
  La --> twt
  twt --> tp
  tp --> Hw
  Hw --> R1
  Hw --> R2
  Hw --> R3
  Hw --> R4

**

IS 10182 Part 1: Symbols, Definitions, Dimensions & Tolerances

Key Symbols (Clause 2.1 & Table 1)

Dimensions & Tolerances (Clause 4.1, Table 1)

IS 10182 Part 1 — Material Requirements Summary

1. Dimensional Tolerances (Clause 4.1, Table 1)

Refer to the full table for all dimensions and max radii (R5 to R10).

2. Chemical Composition Variation (Clause 2.2, Table A-2)

Product analysis is on finished product.

3. Hardenability Requirements (Clause 3.5, Table A-3)

Measured per IS 3848-1966.

Notes:

• Appendix A provides non-mandatory guidelines for manufacturers.
• Material selection aims for optimal mechanical and chemical properties to ensure durability and performance of track shoe sections.

flowchart LR
    A[Material Requirements] --> B[Dimensional Tolerances]
    A --> C[Chemical Composition Limits]
    A --> D[Hardenability Criteria]
    B --> E[Table 1: Dimensions & Tolerances]
    C --> F[

IS 10182 Part 1: Mechanical Properties of Steel

Key Mechanical Properties (Clause 4.1 & A-4)

Hardenability (Clause 3.5, Table A-3)

• Hardenability per IS:3848-1966 standard.
• Achieved by hot rolling, austenitizing, water quenching, and furnace tempering.

Summary:

• Heat Treatment: Austenitize → Water Quench → Temper at 400°C for 2 hrs.
• Mechanical Requirements: Tensile ≥ 100 kgf/mm², Elongation ≥ 14%, Impact ≥ 29 J.
• Hardenability: Specified hardness at various depths ensures uniform mechanical performance.

flowchart LR
    A[Hot Rolled Steel] --> B[Austenitize]
    B --> C[Water Quench]
    C --> D[Furnace Temper at 400°C for 2 hrs]
    D --> E[Achieve Specified Mechanical Properties]

This ensures steel meets IS 10182 Part 1 mechanical criteria for structural applications.

IS 10182 Part 1: Chemical Composition & Specifications for Track Shoe Steel

Chemical Composition (Clause 2.1)

• Boron factor: 1.8 - 2.2 (important for hardenability).

Product Analysis Variation (Clause 2.2)

Hardenability Requirements (Clause 3.5, per IS 3848-1966)

This ensures the steel meets chemical and mechanical properties for track shoe applications in hot rolled condition.

IS 10182 Part 1: Heat Treatment Key Points

1. Hardenability (Clause 3.5, Table A-3)

• Hardenability tested per IS 3848-1966.
• Indicates steel’s ability to harden at various depths after quenching.

2. Mechanical Properties (Clause 3.0)

• Impact value: Minimum 29 J (3.0 kgf·m/cm²).
• Achieved by:
  • Austenitizing hot rolled sections.
  • Water quenching.
  • Furnace tempering at 400℃ for 2 hours.

3. Chemical Composition (Clause 2.1, Table A-2)

• Boron factor: 1.8 - 2.2 (important for hardenability).

4. Testing Locations (Clause 4.1.1, Fig. 3)

• Specimens for tensile, impact, and hardenability tests are taken from specific locations on the steel section (refer to Fig. 3 in the code).

Summary:

• Hardenability ensures required hardness at depths 1.5 to 7 mm.
• Heat treatment: Austenitize → Water quench → Temper at 400℃/2hr.
• Chemical limits ensure consistent steel quality.
• Impact toughness minimum 29 J.

flowchart LR
    A[Austenitize] --> B[Water Quench]
    B

IS 10182 Part 1: Rolling Tolerances Summary

1. Rolling Tolerances Measurement

• Measured as per Fig. 2 (not provided here).
• Key focus on flatness of the link face.

2. Flatness Limits (Clause 7.3)

3. Dimensional Tolerances (Clause 4.1, Table 1)

Notes:

• Convexity is strictly not allowed on the link face.
• Concavity up to 0.5 mm max is acceptable.
• Dimensional tolerances ensure manufacturing precision for track shoe sections.

flowchart LR
    A[Rolling Tolerances] --> B[Measurement as per Fig.2]
    B --> C[Flatness Check]
    C --> D{Convexity?}
    D -- Yes --> E[Not Permitted]
    D -- No --> F{Concavity?}
    F -- ≤0.5 mm --> G[Acceptable]
    F -- >0.5 mm --> H[Reject]

This ensures track shoe sections meet strict geometric quality for safety and performance.

IS 10182 Part 1: Length of Shoe Sections (TS-L1)

• Clause 8.1: Length of shoe sections is not fixed by the code; it is mutually agreed between purchaser and supplier.

• Designation: Shoe section is designated as TS-L1 (Clause 3.1).

• Dimensions & Tolerances:

  • Detailed dimensions and tolerances are provided in the standard's Fig. 1 for TS-L1.
  • Mass calculations use steel density = 7.85 kg/dm³ (Clause 7.85).

Key Notes:

• Length varies per application; no fixed formula in IS 10182 Part 1.
• For mass estimation:
  [ \text{Mass (kg)} = \text{Volume (dm}^3) \times 7.85 , \text{kg/dm}^3 ]
• Volume = Cross-sectional area × Length (agreed value).

Summary Table (Conceptual)

flowchart LR
  A[Purchaser & Supplier] --> B[Agree on Length of Shoe Section]
  B --> C[Calculate Volume = Cross-sectional Area × Length]
  C --> D[Calculate Mass = Volume × 7.85 kg/dm³]

Conclusion: Refer to IS 10182 Part 1 Fig. 1 for dimensions; finalize length by agreement; use steel density 7.85 for mass.

IS 10182 Part 1: Surface Quality and Defects

Key Specifications:

• Material Defects:

  • Piping and laminations are strictly not permitted anywhere.
  • Hairline cracks:
    • Not allowed in Grouser Fillet (Radii R6 & R7).
    • Allowed up to 1 mm depth in other areas, removable by grinding.

• Surface Defects:

  • Defects like linear scars, roll scars, scale scars, jaw scars causing notches are not permitted in Grouser Fillet (R6 & R7).
  • In other areas, defects up to 1 mm depth are allowed without grinding.

• Defect Limits:

  • Number and length of defects are to be mutually agreed between purchaser and supplier.
  • Surface defects must not impair final heat-treated component performance.

Summary Table:

Notes:

• Cutting tolerances on length are to be agreed upon (Clause 8.2).
• Surface quality provisions are exceptions, requiring purchaser-supplier agreement.

flowchart TD
    A[Surface Defects] --> B{Location}
    B -->|Grouser Fillet (R6,R7)| C[No defects allowed]
    B -->|Other Areas| D[Defects ≤ 1 mm depth permitted]
    C --> E[Hairline cracks & scars prohibited]
    D --> F[Grinding allowed for hairline cracks]

This ensures defect control without compromising component integrity after heat treatment.

IS 10182 Part 1 — Testing and Inspection Key Points

1. Specimen Location for Tests (Clause 4.1.1)

• Specimens for Tensile, Transverse Tensile, and Impact tests should be taken as per Fig. 3 (locations specified on the product).
• Tests include:
  • Austenitic grain size determination.
  • Inclusion content by microscopic method.
  • End quench test for hardenability.

2. Dimensional Tolerances (Clause 4.1, Table 1)

3. Chemical Composition Variation (Clause 2.2, Table A-2)

4. Rounding Off Results (Clause 0.4)

• Follow IS 2-1960 for rounding.
• Retain the same number of significant figures as specified.

Summary Diagram: Testing Specimen Locations (conceptual)

graph LR
A[Steel Product] --> B[Tensile Test Specimen]
A --> C[Transverse Tensile Specimen]
A --> D[

Mass Calculation for TS-LI Shoe Section (IS 10182 Part 1)

Key Formula (Clause 5.1)

[ \text{Mass} = \text{mass per meter length (kg/m)} \times \text{length of section (m)} ]

Specifications & Data

(Refer to full table in Clause 4.1 for all dimensions and tolerances)

Density & Tolerances

• Density of Steel = 7.85 kg/dm³ (Clause 7.85)
• Mass tolerance = ± 2.5% on mass per meter length (Clause 7.4)

Calculation Notes

• Convert dimensions to consistent units (e.g., mm to m or dm³).
• Calculate volume of section per meter length using dimensions.
• Multiply volume by steel density (7.85 kg/dm³) to get mass per meter.
• Apply ± 2.5% tolerance to account for manufacturing variations.

Summary

1. Use dimensions from Table 1.
2. Calculate volume per meter length.
3. Multiply by 7.85 kg/dm³.
4. Apply ±2.5% tolerance on mass.

flowchart TD
    A[Dimensions from Table 1] --> B[Calculate Volume per meter]
    B --> C[Multiply by Steel Density (7.85 kg/dm³)]
    C --> D[Mass per meter length (kg/m)]
    D --> E[Multiply by Length]
    E --> F[Total Mass]
    F --> G[Apply ±2.5% Tolerance]

This approach ensures accurate mass estimation for structural design and fabrication

IS 10182 Part 1: Material Recommendations for Hot Rolled Track Shoe Section TS-L1

1. Material Chemical Composition (Appendix A, Clause 2.1)

• Boron factor: 1.8 - 2.2 (important for hardenability)

2. Dimensional Specifications & Tolerances (Clause 4.1, Table 1)