Name: Coiled Tubing
Brand: ZC Steel Pipe

Standard

API Spec 5ST, API Spec 5LCP

Grades

6 grades

Size Range

OD 1"–3.5" (25.4–88.9 mm); WT 0.075"–0.250"+

Applications

→ Well intervention — clean-out, milling, logging, perforating, and hydraulic fracturing operations
→ Completion operations — running and pulling plugs, setting and retrieving downhole tools
→ Wireline and control line installation — electrical wires and hydraulic lines conveyed inside the coiled string
→ Onshore and offshore service — suitable for both well environments without joint make-up at the rig

Physical & Mechanical Properties

Property	Value / Range
Standard (CT)	API Spec 5ST
Standard (coiled LP)	API Spec 5LCP
CT grades	CT70, CT80, CT90, CT100, CT110
Coiled LP grades	X52C – X90C
Yield strength (CT)	483 – 758 MPa (70 – 110 ksi)
Yield strength (CLP)	359 – 621 MPa (52 – 90 ksi)
OD range	25.4 – 88.9 mm (1″ – 3.5″)
Wall thickness range	1.905 – 6.35+ mm (0.075″ – 0.250″+)
Max reel length	8000 m

API 5CT Mechanical Requirements by Grade

Grade	Min–Max Yield MPa / ksi	Min Tensile MPa / ksi	Max Hardness	Heat Treatment
H40	276–552 / 40–80	414 / 60	—	None required
J55	379–552 / 55–80	517 / 75	—	None required
K55	379–552 / 55–80	655 / 95	—	None required
N80-1	552–758 / 80–110	689 / 100	—	Normalise or Q+T
N80Q	552–758 / 80–110	689 / 100	—	Q+T only
L80-1	552–655 / 80–95	655 / 95	23 HRC	Q+T only
L80-3Cr	552–655 / 80–95	655 / 95	23 HRC	Q+T only
L80-9Cr	552–655 / 80–95	655 / 95	23 HRC	Q+T only
L80 13Cr	552–655 / 80–95	655 / 95	23 HRC	Q+T only
R95	655–758 / 95–110	724 / 105	—	Q+T only
C90	621–724 / 90–105	689 / 100	25.4 HRC	Q+T only
T95	655–758 / 95–110	724 / 105	25.4 HRC	Q+T only
P110	758–965 / 110–140	862 / 125	None	Q+T only
C110	758–828 / 110–120	793 / 115	29.0 HRC	Q+T only
Q125	862–1034 / 125–150	931 / 135	None	Q+T only

API 5CT grades manufactured and supplied by ZC Steel Pipe. Grade selection is driven by well depth, H₂S environment, and pressure containment requirements.

Grade	Yield MPa / ksi	Tensile MPa / ksi	Max Hardness	H₂S Service	Typical Application

Sour Service Grade Selection

Procurement Note — H₂S Grade Selection Never substitute P110 or Q125 for a sour-service grade based on cost or availability pressure. NACE MR0175 hardness limits exist to prevent sulphide stress cracking — a brittle fracture mode with no ductile warning in H₂S environments. The correct escalation path is L80 → T95 → C110 depending on H₂S partial pressure and well depth.

Condition	Correct Grade
Mild sour, moderate pressure	L80-1 PSL-2 (+ SR16 HIC test if required)
Moderate sour, high pressure	T95 Type 2 PSL-2 with NACE qualification
Severe sour, high pressure / HPHT	C110 PSL-2 with full NACE + Charpy
Deep HPHT, sweet (no H₂S)	P110 PSL-2 or Q125 PSL-2

API Spec 5ST — CT steel grade coiled tubing (CT70–CT110, 483–758 MPa yield)
API Spec 5LCP — Coiled line pipe grades X52C–X90C (359–621 MPa yield)

Grade Summary

Standard	Grade	Min Yield MPa (ksi)	Max Yield MPa (ksi)
API 5ST	CT70	483 (70)	—
API 5ST	CT80	552 (80)	—
API 5ST	CT90	621 (90)	—
API 5ST	CT100	690 (100)	—
API 5ST	CT110	758 (110)	—
API 5LCP	X52C–X90C	359 (52)	621 (90)

ZC supplies API 5ST coiled tubing in OD 1″ to 3½″ (25.4 mm to 88.9 mm) with wall thickness 0.075″ to 0.250″ (1.905 mm to 6.35 mm). Continuous spool lengths up to 8,000 m (approx 26,000 ft) per reel.

Coiled tubing yield strength 483–758 MPa (70–110 ksi); coiled line pipe 359–621 MPa (52–90 ksi).

WT (in)	WT (mm)	1″	1.25″	1.5″	1.75″	2″	2.375″	2.625″	2.875″	3.25″	3.5″
0.075″	1.905	●	—	—	—	—	—	—	—	—	—
0.080″	2.032	●	—	—	—	—	—	—	—	—	—
0.083″	2.108	●	●	—	—	—	—	—	—	—	—
0.087″	2.210	●	●	●	—	—	—	—	—	—	—
0.095″	2.413	●	●	●	●	—	—	—	—	—	—
0.102″	2.591	●	●	●	●	●	—	—	—	—	—
0.109″	2.769	●	●	●	●	●	●	—	—	—	—
0.118″	2.997	●	●	●	●	●	●	●	—	—	—
0.125″	3.175	●	●	●	●	●	●	●	●	—	—
0.134″	3.404	—	●	●	●	●	●	●	●	—	—
0.145″	3.683	—	●	●	●	●	●	●	●	●	—
0.156″	3.962	—	—	●	●	●	●	●	●	●	—
0.175″	4.445	—	—	●	●	●	●	●	●	●	●
0.188″	4.775	—	—	—	●	●	●	●	●	●	●
0.204″	5.182	—	—	—	—	●	●	●	●	●	●
0.224″	5.690	—	—	—	—	●	●	●	●	●	●
0.250″	6.350	—	—	—	—	—	●	●	●	●	●

Procurement Note Green cells indicate stocked OD × wall thickness combinations. Custom combinations available on request — contact for lead time and minimum spool quantity.

Not sure which grade fits your well or pipeline? Try our free AI pipe grade selector →

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hazel.w@zcsteelpipe.com | WhatsApp +12132393018