ASTM E1019 C, S, N & O Determination in Steel, Iron, Ni & Co Alloys
ASTM E1019-11 is used to determine the concentration of carbon, sulfur, nitrogen, and oxygen, in steel, iron, nickel, and cobalt alloys. The value stated in SI units is to be regarded as the standard.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM E1019 describes standard test methods for determining the carbon, sulfur, nitrogen, and oxygen content in steel, iron, nickel, and cobalt alloys using combustion and inert-gas fusion techniques. These interstitial elements profoundly influence the mechanical properties, corrosion resistance, weldability, and heat-treatment response of metals.
Precise determination of C, S, N, and O is fundamental to quality control in metal production, material certification, heat-treatment verification, and failure analysis in steelmaking, specialty-alloy manufacturing, and aerospace materials processing.
Scope, Applications, and Benefits
Scope
ASTM E1019 evaluates:
- Carbon and sulfur by high-temperature combustion (infrared detection)
- Nitrogen and oxygen by inert gas fusion (thermal conductivity and infrared detection)
- Trace and ultra-trace levels in clean steels and superalloys
- Hydrogen determination (by inert gas fusion, as a supplement)
Applications
- Steel mill and foundry production quality control
- Specialty alloy certification (nickel, cobalt, titanium alloys)
- Weld metal, carbon, and sulfur verification
- Nuclear material interstitial element qualification
- Failure analysis — high C, S, N, or O as defect contributors
Benefits
- Rapid, precise multi-element interstitial analysis
- Detection of trace levels critical in clean steel and superalloy grades
- Supports compliance with material specifications (ASTM A615, AMS 5662, etc.)
- The combustion method provides fast QC for production environments
- Inert gas fusion provides ultra-low O and N for critical alloy certifications
Test Process
Sample Preparation
Metal samples are machined, drilled, or cast into the required form (chips, pins, or turnings); sample surfaces are cleaned to remove oxides and contamination.
1Combustion Analysis (C & S)
The sample is burned in a high-frequency induction furnace at ~1400 °C in pure oxygen; CO₂ and SO₂ evolved are detected by infrared absorption cells.
2Inert Gas Fusion (N & O)
The sample is fused in a graphite crucible at >2000 °C under an inert gas (He); N₂ is detected by thermal conductivity, CO and CO₂ by IR; O is calculated from CO + CO₂ data.
3Calibration & Reporting
Results are calibrated against certified reference materials (NIST SRM or equivalent); concentrations (wt% or ppm) are reported with measurement uncertainty.
4Technical Specifications
| Parameter | Details |
|---|---|
| Techniques | Combustion (C, S); Inert gas fusion (N, O) |
| Detection | IR absorption (C, S, O); TCD (N) |
| Detection Limits | C: 0.0001%; S: 0.0001%; N: 0.0001%; O: 0.0001% |
| Sample Mass | 0.1–1.0 g (method dependent) |
| Applicable Materials | Steel, iron, Ni, Co, and Ti alloys |
Instrumentation Used for Testing
- Combustion analyzer (LECO CS844, EMIA series, or equivalent)
- Inert gas fusion analyzer (LECO ONH836 or equivalent)
- Certified reference materials (NIST SRMs for steel)
- Analytical balance (±0.01 mg)
- Sample preparation tools (lathe, drill press)
Results and Deliverables
- C, S, N, O concentrations (wt% or ppm)
- Calibration reference material data
- Measurement uncertainty statement
- Compliance comparison to the material specification
- Full combustion/fusion analytical report per ASTM E1019
Why Choose Infinita Lab for ASTM E1019?
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Frequently Asked Questions
Carbon governs hardness and hardenability; excessive carbon causes brittleness and weldability problems. Sulfur improves machinability but reduces toughness, ductility, and weldability. Both are tightly controlled in structural, pressure vessel, and weld filler materials.
Oxygen forms oxide inclusions that degrade fatigue life, toughness, and machinability. Ultra-low oxygen steels (< 5 ppm) are required for bearing steels, aerospace fasteners, and critical structural components. Inert gas fusion provides the sensitivity needed for these measurements.
Nitrogen in solid solution increases yield strength but reduces ductility and toughness, and causes strain aging. In austenitic stainless steels, nitrogen is a beneficial austenite stabilizer. The nitrogen content balance is critical in many alloy systems.
Samples should be in the form of chips, drillings, or pins free from surface oxidation, oil, and contamination. Surfaces are typically cleaned by solvent washing and light abrasion. Sample mass is weighed precisely to 0.01 mg for accurate concentration calculation.
Yes. Inert gas fusion is applicable to titanium, niobium, tantalum, and other refractory metals for N and O determination. Combustion methods require optimization for materials that oxidize at different temperatures than iron-based alloys.
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