What hardness tolerance can you guarantee?

We guarantee ±0.5 HRC within each batch, verified by Rockwell hardness testing on every coil. This is tighter than the ±2-3 HRC typical of steel traders.

Do you provide test reports?

Yes. Every batch ships with a Rockwell hardness test report showing measured values, target range, and lot number for full traceability.

What tolerance standards do you follow?

We supply to EN 10132-4 tolerance classes: T2-T3 for thickness, W1-W2 for width, Class 3 surface roughness, and maximum straightness deviation of 1mm per 3 meters.

Quality Control & Certifications | ±0.5 HRC | ISO 9001

Our Standard

Hardness is Our Product

Steel traders sell by grade name. We sell by hardness value. That distinction drives everything about how we operate.

±0.5

HRC Tolerance

Within every batch. Verified by calibrated Rockwell hardness tester on multiple points per coil.

100%

Batch Testing

Not statistical sampling. Every production batch is individually tested before release.

1 mm

/ 3m Straightness

Maximum camber deviation. Critical for band saw blades, die cutting rules, and doctor blades.

Testing

What We Test

01

Rockwell Hardness (HRC / HRB)

Multiple points per coil, calibrated tester, target range and actual values recorded.

02

Vickers Hardness (HV)

For doctor blades and thin gauge strip where HRC is not appropriate. HV 580–670 range.

03

Thickness & Width Dimensional

Digital micrometer measurements per EN 10132-4 tolerance classes T1–T5 / W1–W3.

04

Straightness & Flatness

Measured over 3-meter spans. Maximum deviation 1mm/3m for standard supply.

05

Surface Quality

Visual and Ra roughness inspection. Class 3 surface finish standard; polished white/blue/yellow per spec.

Standards

Tolerance Standards We Follow

Our standard supply condition is T2–T3 thickness tolerance and W1–W2 width tolerance per EN 10132-4. Tighter classes available on request.

Thickness Tolerance Classes (EN 10132-4)

Thickness (mm)	T1 (±mm)	T2 (±mm)	T3 (±mm)	T4 (±mm)	T5 (±mm)
0.020–0.040	0.002	0.003	0.004	0.005	0.008
0.040–0.080	0.003	0.004	0.006	0.008	0.012
0.080–0.150	0.004	0.006	0.008	0.012	0.018
0.150–0.300	0.005	0.008	0.012	0.016	0.024
0.300–0.600	0.008	0.012	0.016	0.024	0.035
0.600–1.000	0.010	0.016	0.022	0.030	0.040
1.000–1.600	0.014	0.020	0.028	0.036	0.050
1.600–2.500	0.018	0.026	0.035	0.045	0.060

Standard supply: T2–T3 class. T1 available for critical applications (valve reeds, doctor blades).

Width Tolerance Classes

Width (mm)	W1 (±mm)	W2 (±mm)	W3 (±mm)
≤ 25	0.05	0.10	0.15
25–50	0.08	0.15	0.25
50–100	0.10	0.20	0.35
100–200	0.15	0.30	0.50
200–300	0.20	0.40	0.60

Additional Quality Parameters

Parameter	Standard	Our Capability
Straightness (camber)	EN 10132-4	≤ 1.0 mm / 3 m
Surface roughness	EN 10132-4 Class 3	Ra ≤ 0.8 μm (polished); Ra ≤ 1.6 μm (standard)
Flatness	EN 10132-4 Class 3	Measured per coil
Edge condition	—	Slit, deburred, square, or rounded — per spec
Surface finish options	—	White polished, blue, yellow, black, natural

Certifications

Certifications & Compliance

ISO 9001:2015

Quality management system certified. Covers heat treatment, slitting, tooth cutting, and inspection processes.

EN 10132-4

Tolerance classes and testing methods per European standard for cold-rolled narrow steel strip.

Lot Traceability

Every coil is lot-numbered. Hardness reports, material certificates (MTC), and processing records traceable to batch.

Deliverables

What Ships With Every Order

Standard (included)

+ Rockwell hardness test report (HRC or HV)
+ Lot number on every coil
+ Dimensional verification (thickness, width)
+ Visual surface inspection pass
+ Protective packaging for export

Available on Request

+ Material Test Certificate (MTC / EN 10204 3.1)
+ Metallographic report (microstructure)
+ Fatigue test data
+ Surface roughness Ra measurement
+ Custom packaging and labeling

Every Coil Tested.
±0.5 HRC Guaranteed.

Hardness is Our Product

What We Test

Tolerance Standards We Follow

Thickness Tolerance Classes (EN 10132-4)

Width Tolerance Classes

Additional Quality Parameters

Certifications & Compliance

What Ships With Every Order

Standard (included)

Available on Request

Quality Questions?

Every Coil Tested.±0.5 HRC Guaranteed.

Hardness is Our Product

What We Test

Tolerance Standards We Follow

Thickness Tolerance Classes (EN 10132-4)

Width Tolerance Classes

Additional Quality Parameters

Certifications & Compliance

What Ships With Every Order

Standard (included)

Available on Request

Quality Questions?

Every Coil Tested.
±0.5 HRC Guaranteed.