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Ferrous
Stainless Steel Turnings
Grade: Various (300/400 Series Mixed)Medium-High Tier
Turnings and chips from stainless steel machining, 400/300 series
Market Price EstimateUpdated Daily
$1,450/ MT
+65 (4.7%)vs yesterday
Verified specifications & market data
Chemical Composition
Elemental breakdown by percentage weight.
Standard composition limits
Values represent maximum allowed percentage unless otherwise noted.
Physical Properties
Material form, density, and contamination specifications.
Fine fragmented stainless steel waste; mixed composition (300/400 series); requires special handling and processing; recovery-focused material
Acceptable Inclusions
- Oil residue <5% (inherent; machining turnings source)
- Coolant residue <2% (combined with oil)
- Fine iron oxide (oxidation from machining)
- Carbon/steel contamination <2% (expected in mixed shops)
Prohibited Materials
- Carbon steel >5% (grade mixing; must be stainless-only)
- Non-stainless ferrous >5%
- Copper/brass >0.5% (contamination)
- Non-ferrous metals >0.5% each
- Synthetic polymers >1% (coolant residue)
- Radioactive materials
- PCB or hazardous electronics
- Asbestos materials
- Mercury components
- Excessive oil >5% (furnace contamination)
Quality Assurance
Testing protocols, sampling methods, and acceptance criteria.
Sampling Protocol
frequencyRandom selection from different depths
maximumQuantity50 samples per truck
minimumQuantity1–2 tonnes or 30–40 samples
notesMixed composition and oil contamination require robust sampling
percentage10–15% of lot
Acceptance Limits
all Criteria Must Passcriteria must be met; stainless-dominant especially critical
carbon ContentC <0.15%
carbon Steel Limit<5% ferrous contamination
non Ferrous Total<0.5% each element
oil ContentOil <5.0%
stainless ContentPredominantly stainless
visual Contaminants<1% non-stainless visible; predominantly stainless appearance
Weight Tolerance
variance±5% acceptable from purchase order weight
Required Test Methods
Visual Inspection + Magnetic Test
Purpose
- Assess oil saturation, detect non-stainless contamination, identify ferritic (magnetic) vs. austenitic (non-magnetic)
Acceptance Criteria
- Pass: Oil color normal (not excessively dark)
- <5% oil apparent
- predominantly stainless appearance
Procedure
- 100% visual scan of samples
- magnetic test on representative samples (mixed ferritic/austenitic expected)
Oil Content Testing
MANDATORY
Purpose
- Verify oil <5% (machining turnings tolerance
- relaxed vs. solid stainless <1%)
Acceptance Criteria
- Pass: Oil <5.0% by weight after drying
Procedure
- test
- critical for furnace compatibility
XRF Spectrometry
Purpose
- Verify predominantly stainless (Cr ≥12%, Ni blend 0-14%, Mo 0-3%)
- detect carbon steel contamination
Acceptance Criteria
- Pass: Confirmed stainless composition
- Cr ≥12%
- carbon steel <5%
- overall stainless-dominant
Combustion Analysis
Purpose
- Verify carbon <0.15%, sulfur <0.04%
Acceptance Criteria
- Pass: C <0.15%, S <0.04%
Grade Mix Assessment
Purpose
- Estimate 300 series (austenitic) vs. 400 series (ferritic) ratio via magnetic response
Acceptance Criteria
- Pass: Confirmed mixed stainless
- predominantly 300 or 400 series acceptable
Procedure
- Magnetic tests on multiple samples
- ratio estimate acceptable (mix confirmation)