C67S 1.1231 High Carbon Spring Steel Strip

Spring steel is a type of steel that is specifically used to make springs and elastic parts because it can return to its original shape after bending, compression, or extension. This ability, known as elasticity in the quenched and tempered state, arises due to the high yield strength of the steel, which comes from its specific composition and hardening process. Fabricating spring steel requires advanced technical skills to ensure high quality. Any defects on the surface, such as decarburization or irregularities, can reduce fatigue strength. Baomit strip steel ensures that the springs have a perfectly smooth surface for optimal efficiency and performance.

Parameters	Recommendation
Steel Grade	C67S
Brand	Baomit
Certification	ISO9001:2015
Hardness	48 – 52 HRC
Surface Finish	White polished
Edges	Slit, square or round
Thickness Tolerance	+/- 0.005
Width Tolerance	+/- 0.10
Camber	Max 1mm per 3m

Our Advantages:

• Excellent fatigue resistance

• Excellent punching and stamping properties

• Precise thickness and width tolerances

• Maximum straightness deviation of 1 mm / 6 m

• Good surface finish

• Consistent, uniform microstructure

Chemical Composition of Steel C67S (1.1231): EN 10132-4-2000

C	Si	Mn	Ni	P	S	Cr	Mo
0.65-0.73	0.15-0.35	0.60-0.90	max 0.40	max 0.025	max 0.025	max 0.40	max 0.10

Thickness Tolerances

Thickness (mm)	Tolerances ± mm
Thickness (mm)	T1	T2	T3	T4	T5
0.020 - 0.040	0.004	0.003	0.002	-	-
0.040 - 0.100	0.006	0.005	0.004	0.003	0.002
0.100 - 0.125	0.007	0.005	0.004	0.003	0.002
0.125 - 0.160	0.009	0.006	0.005	0.004	0.003
0.160 - 0.200	0.010	0.007	0.005	0.004	0.003
0.200 - 0.250	0.011	0.008	0.006	0.004	0.003
0.250 - 0.400	0.015	0.011	0.008	0.006	0.004
0.400 - 0.600	0.020	0.014	0.010	0.007	0.005
0.600 - 0.800	0.023	0.017	0.012	0.008	0.006
0.800 - 1.000	0.027	0.019	0.013	0.009	0.007
1.000 - 1.250	0.034	0.024	0.017	0.012	0.008
1.250 - 1.600	0.039	0.028	0.020	-	-
1.600 - 1.750	0.046	0.033	0.023	-	-

Width Tolerances

Thickness (mm)	Width (mm)	Tolerances ± mm
Thickness (mm)	Width (mm)	W1	W2	W3
≤0.25	≤50	0.10	0.07	0.05
	50 - 125	0.15	0.11	0.07
	>125	0.20	0.15	0.10
0.25 - 0.50	≤50	0.15	0.11	0.07
	50 - 125	0.20	0.15	0.10
	>125	0.25	0.20	0.15
0.50 - 1.00	≤50	0.20	0.15	0.10
	50 - 125	0.25	0.20	0.15
	>125	0.30	0.25	0.15
1.00 - 1.60	≤50	0.20	0.15	0.10
	50 - 125	0.30	0.25	0.15
	>125	0.35	0.25	0.20
1.60 - 1.75	≤50	0.30	0.20	0.15
	50 - 125	0.35	0.30	0.20
	>125	0.40	0.30	0.20

Surface Roughness

Available in white polished, blue polished and yellow.

Thickness (mm)	Roughness
Thickness (mm)	Class 1	Class 2	Class 3
≤0.50	Ra≤ 0.30 µm Rt≤ 3.00 µm	Ra≤0.25 µm Rt≤ 2.50 µm	Ra≤ 0.20 µm Rt≤ 2.00 µm
0.50 - 1.00	Ra≤ 0.35 µm Rt≤ 3.50 µm	Ra≤ 0.25 µm Rt≤ 2.50 µm	Ra≤ 0.20 µm Rt≤ 2.00 µm
1.00 - 1.75	Ra≤ 0.40 µm Rt≤ 4.00 µm	Ra≤ 0.30 µm Rt≤ 3.00 µm	Ra≤ 0.30 µm Rt≤ 3.00 µm

Flatness Deviation

Maximum flatness deviation per inch strip width.

Thickness (mm)	Flatness Deviation
Thickness (mm)	Class 1	Class 2	Class 3	Class 4
0.02 - 0.10	P60	P50	P40	P30
0.10 - 0.25	P50	P40	P30	P20
0.25 - 0.50	P40	P30	P20	P10
0.50 - 1.75	P35	P25	P15	P10

Straightness Deviation

Strip Width (mm)	Measured Length (3m)
Strip Width (mm)	Class 1	Class 2	Class 3
≤50	3 mm	2 mm	1 mm
50 - 125	3 mm	2 mm	1 mm
>125	3 mm	2 mm	1 mm

C67S Spring Steel Strip

Place of Origin: China

Manufacturer: Hubei Baomit Steel Materials Co., Ltd.

Steel Grade: C67S

Equivalent Grades: SAE1070

Supply Condition: Hardened and Tempered (H & T)

Applications: Springs, blades, strippers, scrapers

Brand: Baomit

Min Order: 1 Ton

Package: Pallet

Delivery Time: 4-5 weeks

Payment Term: L/C, T/T, Western Union

Production Capacity: 300 tons per month

"Baomit strip steel stands for precision, quality and high performance. Our material is excellent in terms of comprehensive delivery indicators, such as straightness, flatness, mechanical properties and metallographic uniformity."

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